If you go to a big tesco they quite often have specials on. Thats how I got my HDTV.
I think I payed 350 quid for a make I had never heard of digi something. Wide screen does the job and has a built in DTV. Combined with a Technica home theatre for 50 quid and jobs a goodun.
And you do need another box for HD telly you can get one of them at tesco's as well with a 500G disk for recording for just under a hundred (Guess what I was looking at about 3 hours ago)