Hmmm, well i have to admit i dont 100% know but this is what i was told on my HD Training.
UK HD TV is PAL, 25 FPS, US HD TV IS NTSC, 30FPS
That alone would mean No, as the frame rates would be different...
Then they went on to say that HD TVs are in some way made so they can only have native things attached, so you cant attach a NTSC HD-DVD Player to a PAL HD TV Set.
The reason they said was so us UK guys cant buy a NTSC Player and get the movies imported before country release dates...
I have a feeling this is just one of those things they tell you, so you tell the customer, they tell their friends, all so they can sell more UK dvd's...
However, i think i am inclined to agree with the frame rate thing, as currently you cant take a UK TV to the USA unless is supports PAL and NTSC. I am aware that there are Sony Sets that do both.
Check the specs and that should tell you if it can support ntsc.