MI5, the Security Service, protects the UK against threats to national security at home, primarily terrorism and threats posed by states. Its sister service SIS, better known as MI6, is the UK's foreign intelligence service and gathers intelligence overseas. If you have an MI5 interview coming up, the most useful thing to know is that MI5 publishes what it is assessing: nine competencies, grouped under three themes.
MI5 uses competency based interviews for all of its roles, held by telephone, video call or face to face. Its own description is that the interview is timed and structured and comprises specific questions relating to each competency area being assessed, and that you will typically have around five to ten minutes per question. That makes preparing for MI5 more concrete than preparing for most employers, because you can practise against the thing that is actually being scored.
Below are ten questions of the kind those competencies point to, what each one is really testing, and how to answer. First, it helps to know where the interview sits in the wider MI5 application process.
Where the interview sits in MI5's recruitment process
MI5 runs a published recruitment process that varies according to the role, and it does not accept CVs unless a specific role requires one. The named phases are pre-screening, application and vetting. MI5's application process page says the process can last from six to nine months, while several role pages quote nine to twelve, so plan for six to twelve months depending on the job. You may only submit one application at a time.
What sits between those phases is role specific. Three routes MI5 publishes in full:
- Intelligence Officer Development Programme: initial online application and pre-screening; two situational judgement tests, one general and one specific to Intelligence Officer work; the full online application, completed only if you pass both; a 90 minute online investigative assessment testing your proportionate judgement in relation to a fictitious investigation; a telephone interview; an online assessment centre made up of a competency interview, two role plays and a written assessment, which may be followed by a Final Selection Board; then a conditional offer and Developed Vetting.
- Foundation Analyst: initial application with a Cognitive Ability Test and a short transcription assessment; a full application with competency based questions; a telephone interview covering both competency and strength based questions; an online assessment centre involving interviews, role plays and written exercises; and a hearing test as the final, role specific stage.
- Vetting Officer: initial application; a situational judgement test; the full application form; a telephone interview; then an assessment centre.
The telephone interview is a named stage on all three, and it is a full competency interview rather than a screening call. Treat it as the real thing, because it is.
Notice what MI5 does and does not name. It names a Cognitive Ability Test, a transcription assessment, situational judgement tests and an online investigative assessment, and which of those you sit depends entirely on the role. There is no single MI5 aptitude test, so anyone selling you one is guessing at the format.
The nine MI5 competencies
MI5 groups its nine competencies under three themes.
Future
- Seeing the bigger picture
- Driving innovation and change
- Continuously developing
People
- Communicating and influencing
- Working collaboratively
- Leading inclusively
Delivery
- Making effective decisions
- Delivering outcomes
- Providing customer value
Five to ten minutes is a long answer, and most candidates run dry after ninety seconds. Prepare one worked example for each of the nine, built the same way every time: the situation, what you personally did, and what changed because you did it. Do not use the same story for more than two competencies.
1. What inspired you to pursue a career in MI5?
There are many ways to answer this, but the most important thing is to be honest, because a vague answer will not survive the follow up questions. The interviewer wants to know what actually moved you towards this work.
Ground the answer in what MI5 does. Its three published work areas are countering terrorism, countering state threats and protective security, and it carries out investigations by obtaining, analysing and assessing intelligence, then working with partners to disrupt threats. Protective security is delivered largely through the National Protective Security Authority, which is part of MI5 and advises businesses and organisations. Name the area that draws you, and say why.
Avoid the fictional version of the job. An answer built on the idea of being a spy reads as someone who has not looked at the organisation. An answer built on analysis, patience and public protection reads as someone who has.
One practical trap: MI5 asks applicants not to discuss their application with anyone other than a partner or a close family member, and not to mention it on social media. If you are asked how you prepared, do not volunteer that you have been talking it over with friends.
2. What do you think are the key qualities required for the job?
You do not have to guess at this one, because MI5 publishes the answer. The nine competencies are the qualities, and they are what the interviewer is scoring against.
Do not recite all nine. Pick the two or three that genuinely matter most for the role you have applied for, and say why. For an Intelligence Officer role, making effective decisions and communicating and influencing carry obvious weight, given that the assessment centre includes two role plays and a written assessment. For an analyst role, seeing the bigger picture and delivering outcomes are closer to the daily work.
Then prove each one with a short example rather than asserting it. Clear written and spoken communication matters throughout, because intelligence work is largely the business of turning a mass of material into something another person can act on. Avoid generalities and clichés.
3. What do you know about MI5's history and its mission?
This is a question you can simply know the answer to, which makes it a cheap mark to drop.
MI5 was established in 1909 as the Security Service Bureau. Its functions were first placed in legislation by the Security Service Act 1989, the point at which a service that officially did not exist became a statutory one with a defined remit. Today it exists to protect the UK from threats to national security, primarily terrorism and threats posed by states, and it works across three areas: countering terrorism, countering state threats and protective security.
Two further details are worth carrying in. The Director General, currently Sir Ken McCallum, is the only member of staff whose identity is made public. And the National Protective Security Authority, which advises businesses and organisations on their own security, is part of MI5.
Be precise about the MI5 and MI6 distinction, because it is the thing candidates most often get wrong. MI5 protects the UK against threats to national security at home. SIS, better known as MI6, is the UK's foreign intelligence service and gathers intelligence overseas. MI5's own framing is that it works very closely with SIS and GCHQ, that the three have different but related functions, and that there are many areas where they work together, including through joint teams. MI5 sets all of this out on its about us page, which is the source worth revising from.
4. What do you think sets MI5 apart from other intelligence agencies?
Answer with remit, not with prestige.
MI5 is the agency responsible for protecting the UK against threats to national security at home. SIS gathers intelligence overseas, and MI5 describes itself, SIS and GCHQ as having different but related functions within the UK intelligence community. That domestic remit shapes everything about the work: investigations run alongside police and other partners, and the measure of success is a threat disrupted rather than a report written.
The second genuine difference is protective security. Through the National Protective Security Authority, MI5 advises businesses and organisations on protecting themselves, a public facing role its sister agencies do not have.
The third is the breadth of the workforce. More than 5,000 people work in MI5, and the intelligence officer is only one of them: the service also runs on analysts, technologists, linguists, surveillance staff and corporate specialists. If you can say where your own skills sit in that range, this question becomes an easy one.
5. How would you deal with a difficult situation?
This is the making effective decisions competency, and it is the one MI5 tests twice. The interview asks you to describe a decision you took. The Intelligence Officer Development Programme also includes a 90 minute online investigative assessment, which MI5 describes as testing your proportionate judgement in relation to a fictitious investigation.
Proportionate is the operative word. The service is looking for people who match the response to the actual risk, escalate when they should, and can explain why they drew the line where they did. So build the answer around the judgement rather than the drama: what you knew, what you did not know, the options you weighed, what you chose, and what you would do differently now.
Use a real situation with a real decision in it. Situational judgement questions are good rehearsal for the habit being tested here, which is choosing between defensible options rather than between right and wrong.
6. What do you think makes a successful intelligence officer?
Three qualities, and each maps onto something MI5 publishes.
Analysis comes first. An intelligence officer has to take a large volume of material, distil it to what matters and see the patterns other people miss. MI5's own description of the work is obtaining, analysing and assessing intelligence, in that order, and the Foundation Analyst route opens with a Cognitive Ability Test and a short transcription assessment for exactly this reason.
Resourcefulness comes second. That means knowing where information is likely to be, persuading people to cooperate, and finding a way through when the obvious route is closed. In competency terms it sits close to driving innovation and change, and it is why the assessment centre uses role plays rather than more questions.
Last but not least, an intelligence officer needs grit. Investigations run for months and often longer, the recruitment process alone can take from six months to a year, and much of the work is patient accumulation of detail that may lead nowhere. MI5 calls the related competency continuously developing: staying with a hard problem, learning from what did not work, and coming back at it differently. Say that, and then give an example of a time you did it.
7. Describe a time when you had to use discretion and tact.
Every employer asks a version of this. At MI5 it carries more weight, because discretion is a condition of employment rather than a soft skill.
MI5 asks applicants not to discuss their application other than with a partner or a close family member, and gives every applicant bespoke cover advice. Most employees also need Developed Vetting, the highest level of UK government security clearance, which involves detailed questionnaires, agreed references and a vetting interview covering family, friends, finances, health, relationships, drugs and alcohol, and travel. Your answer here is a preview of how you will handle all of that.
- Choose a genuinely sensitive situation rather than a merely awkward one: handling confidential information, a colleague's personal circumstances, or a dispute where the details could not be shared.
- Explain what you actually did and said, and what you deliberately did not say.
- Give the outcome, and be honest if it was imperfect.
Under MI5's framework this sits with communicating and influencing. Avoid an example where discretion meant saying nothing at all. The service needs people who get the right information to the right person at the right time, not people who default to silence.
8. What do you consider to be your greatest strengths and weaknesses?
Note first that some MI5 interviews mix competency and strength based questions. The published Foundation Analyst process describes a telephone interview covering both. A strength based question asks what energises you rather than what you have already done, so expect versions like which part of your working week you would keep if you could keep only one.
For strengths, choose something that maps onto a published competency and then evidence it. If the role turns on accuracy, attention to detail is a fair answer, but only if you can point to a time it caught something that mattered.
For weaknesses, the safest ground is continuously developing: a real gap, what you are doing about it, and the progress so far. Do not offer a weakness that cuts against a condition of the job. Saying you find it hard to keep things to yourself, or that you struggle without recognition, answers a very different question from the one you were asked.
9. Where would you like to see your career with MI5 take you?
This is seeing the bigger picture, and the trap is answering with a job title.
Be realistic about the timescale. MI5 says the recruitment process itself runs from six to nine months, with some role pages quoting nine to twelve, and most employees then need Developed Vetting. Nobody joins and moves quickly. An answer that assumes otherwise tells the interviewer you have not read the process.
Better to answer with capability than with rank: the kind of work you want to be trusted with, the specialism you want to build, and how that serves the job of protecting the UK from terrorism and state threats. Naming a direction within the organisation is fine, and it shows you know the range of roles, but tie it to what you want to be good at rather than what you want to be called.
10. Do you have any questions for me about this role, or working for MI5?
This is the one question where you choose the subject, so use it to show you have read the organisation rather than a careers blog. Avoid anything MI5 already publishes, such as the stages of the process or the eligibility rules, because asking those signals you have not looked.
Questions that work:
- Which of the nine competencies matters most in this role day to day?
- What does the first year look like once Developed Vetting is complete?
- How does this team work with partners elsewhere in the intelligence community?
- What kind of opportunities are available for career progression within MI5?
- What challenges do people in this role typically run into?
How to prepare
Write one worked example for each of the nine competencies, then time yourself delivering each at five to ten minutes, which is far longer than it sounds. Read MI5's own interview preparation guidance rather than second hand summaries of it. And if your route includes online stages, rehearse the formats rather than the trivia: numerical reasoning and verbal reasoning for the cognitive ability assessment, and situational judgement for the judgement stages.
