Hi Naper,
first of all, welcome to the forum!
If your TV is NTSC, then you'll certainly need a converter, in order to be able to watch images thru the PAL system while in the UK.
You'll easily find those converters, but what I'm not sure if there's any available for HDTV. As far as I know, I've only seen analog converters though.What I suggest you to do is to contact the followeing site:
www.world-import.com up in IL; they pretty much have what you're looking for. Keep us posted on what's going on.
Cheers / Avliner.