Yes, we regularly pick up things like this, as well as issues that arise because of the DWP not having a Council Tax database – therefore we have had "non-deps" claiming housing costs, one joint tenant claiming for the full cost of the rent, etc ,etc. Stock answer – "Tell them to put it on their journal" – ermm, but we're telling you, we've got the facts – not interested …
I think the level of Fraud in UC, particularly involving the housing costs element – is going to break all records by a long way.
