Claim: While Boris Johnson was mayor of London, crime fell by 20%.
Fact-check: Did crime fall while Boris Johnson was Mayor of London? - Full Fact
Verdict: this is a fair estimate using the best available data. the crime rate fell by 23% between 2007/08 and 2015/16, though this only looks at crime recorded by the police and there are other caveats to this data.
Organisation: Full Fact
Author: Abbas Panjwani
Date published: 2019-06-18T00:00:00