Cheers for the feedback Taf. The remote has a DVB menu button through which the channel scan is selected. I decided to try a firmware update and after I selected this option the search process started but seems to have stalled on 83% progress. I'm not yet sure if this is a good or bad sign...
---------- Post added at 20:35 ---------- Previous post was at 19:27 ----------
Firmware update stalled totally so I cancelled it.
Just had a thought - if we can't get this to work properly would another option be to get a cheap Freeview box and watch TV via this? Despite being quite old the TV set is in very good nick and had been barely used when we got it.