If it's an older CRT TV (the big heavy kind that everyone had before flat screen TVs) you're probably out of luck.
If it's a newer LCD or plasma, you might be able to bring it over and have it work. One of the issues you may run into, though, is a lot of audio/video equipment in the UK connects to each other via SCART connections, which are not used in the US. If, however, your equipment and your TV has composite RCA connectors (usually a set of three which are yellow, white, and red) or component RCA (a set of three which are red, blue and green) or HDMI, it might work.
That's about as good an answer as I can give without more information. If you post the exact model number, I might be able to figure it out from info on the web.
[EDITED TO ADD] We've got a UK Bravia, and having looked into it a bit more through the manual and a little Googling, there's not a definitive answer, but it doesn't look too good. The tuner most likely will not pick up UK broadcasts, but you might be able to plug in a cable/satellite box and have it work. If I were in your shoes I'd sell the US TV and put the money toward buying a new one in the UK that you can be sure will work.