Paul...are you sure that you don't need a TV licence to view on Catch-up TV?
I used Catch-up occasionally, on my Samsung 7 inch Tablet, when I can't sleep at night. The name Catch-up is somewhat of a misnomer, as it appears to broadcast live TV, and I thought you needed a licence for that ?
Catch up Television is the collective name for on demand services like BBC iPlayer, ITV Player, All4 and Demand 5. You do not need a license for these services (at the moment).
TVCatchup is an app that re-streams live TV. You do need a license to watch this, though it falls out of the definition of a live trasmission watched through a recie.ver