HMRC can't even get near the big multi-nationals that have offices in this country but use loopholes to avoid £m's in tax. They're hardly going to go after a company registered in Panama, with no offices here, to get the real ID of some escort.
Anybody who avoids tax is open to be caught out, in truth very few are.
no doubt that's why off shore companies are used for such things
much simpler means would be implied to get proof confirm ID etc
such as a member of public passes on enough information like addresses, twitter, Facebook AW etc details ,
description any known names and so on for them to act
or as i said HMRC or police make a booking though AW and confront said evader or put them under surveillance
and when they are arrested a search is conducted including electronics internet history etc etc ,
bank accounts and so fourth and cross referenced blah blah
similar methods have been used on other cases of fraud etc