Thanks for your reply.
Yes. I thought thats how it happened previously (auto switching if no response), but lately it has not. Instead I just get the "5 Minute", "About To Start" and "Has Just Started" pop ups, but not auto switching. Does it depend on how far ahead the required programme is in the epg on how it responds?
Ive also noticed if its quite near to the programme start time it doesnot give the "Set Reminder" option anyway anyway?