Yes and one of the ways they can prove they are habitually resident is to set up shell companies which don't actually exist such as shops which will then report their earnings to HMRC so it looks like they actually live here. Very few checks have been made by HMRC on the legitimacy of these companies until recently. As it looks as though they are earning a decent amount, they aren't called in for appointments so they can continue to claim U C without question.
Lots of these people aren't even in this country. They make all sorts of excuses not to attend appointments to continue their claims when they are caught. They will then produce false documents showing school attendance, doctors registration etc to prove they are here (the documents are often laughably poor).
The old system of JSA was that if you didn't turn up to sign on, your money was not released from the system. Now it can continue to be paid to people and their full families who aren't even in this country.
Multiple claims of housing costs are made for the same properties. False childcare costs are claimed.
Any possible loophole is exposed and abused.