I'm aware of someone (not me!!) who has claimed UC for 3 years whilst having in excess of £30k savings. The threshold is £16k savings for UC. I think they receive @ £800 per month.
They definitely know they should not be claiming.
What proportion of fraud cases like this do DWP discover without being tipped off? Is it just random checks?
Also what is the likely punishment? I have read charts which give starting point suggestions eg custodial sentence and fine but I wondered in reality what the most likely outcome is.