1. I don't show them my passport (and nobody in the UK has the right to see it)
2. I don't use my UK bank account for overseas transactions
3. Only the first 2 people in a property pay council tax
4. Electoral role has quite a few people missing from it, including the homeless
I haven't lived at my UK home address for 16 years, nor does anyone I know.
My bank, the DWP, HMRC, Passport Office, credit check agencies et al, haven't noticed yet.
While it may seem quite easy for them to check all this stuff, for some reason they don't.