No evidence needed you either believe it or not. The person in question was also an illegal overstayer originally, who not only had an NI number and a job when arrested but also a HA flat in one of the best projects in London, all while totally illegal. They did not take the flat off her and when she wangled the right to stay collect 16k to move out and bought another flat now worth half a million. That was 30 years ago, since then the UK has become an even bigger push over.