Thanks for the feedback Flashinthenight86 and Xagoln. The main reason for using BT is that the comfortable viewing position for the low res provided by the TV out on a 40" screen is several feet away; the TV is currently in the bedroom of the place I share, so BT allows me to use it in bed, and will be in the living/dining-room of the flat I will hopefully soon move into, where it'll be used from the couch or dining table. This means that in an ideal world I'd like to be able to simply turn on the TV with the remote, pick up the kb sat next to it and crack on. Plus, I don't yet have a powered hub!

If other people find this useful, they can of course use wired input.