To report an imminent threat call 999 or ring the Anti-Terrorist Hotline on 0800 789 321
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To report an imminent threat call 999 or ring the Anti-Terrorist Hotline on 0800 789 321
Current national threat level: SUBSTANTIAL Read more about threat levels >>
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MI5 BETWEEN THE WARS
The years immediately after the First World War saw MI5's size being reduced drastically as a result of post-war cost-cutting. The Service's very existence came under threat for a time, but by the start of the 1930s it had gained new importance in countering communist and fascist subversion in the UK. It also played a leading role in countering Soviet espionage and obtaining information on Nazi Germany.
The inter-war years
MI5's fight for survival after World War I and its penetration of Nazi Germany's London embassy
The Soviet threat between the wars
How MI5 countered Soviet intelligence activities in the UK
Latest News
view ALL NewsMI5 commemorates VE Day 75
Like the rest of the country, MI5 pays tribute to the service and sacrifice of the entire Second World War generation
MI5 headquarters lights up blue for carers
The Thames House entrance archway lit up blue on Thursday 16 April alongside other UK landmarks to show our...
MI5 issues apology to LGBT community for historical treatment
The Director General has expressed MI5's "regret and shame" for historical treatment of LGBT community
