There are a few things to consider:

1. UK is PAL, and the US is ATSC, so the tuner may have an issue. If you're planning on cable/sat box connections, then that shouldn't be too big of a deal.
2. The voltage differences/connections may need to be regulated so as not to stress out the power supply.
3. Even so, TVs broadcast in the UK at 50hz, and the US at 60Hz, so many peripherals may not be able to work properly with the television.
4. Service for the television will not be available in the US for a UK set. So if it breaks, there's not much that can be done to fix it.

My recommendation - and this is an "ideal" - is to own a television for the region it will be in. People have traveled with their televisions, and with mixed reviews. The reality is that the transition may be difficult, and more trouble than it's worth - or not.