The following link takes you to the 'Which' website, where there is quite an informative article on Insurance Fraud, in particular 'Crash For Cash' frauds.
I realise that a lot of forumites are aware of the problems, but there is some useful information.
https://www.which.co.uk/news/article/the-most-common-types-of-insurance-fraud-and-how-to-fight-your-corner-if-you-fall-victim-a6F0T5S0mYjY