Only the part of the television that receives broadcasts. If you want to use it as a monitor for your VCR (or as a paperweight), you should be OK ;-)...

This question, by the way, has been asked and answered in another thread:

Television in Japan

Frequencies and standards differ in different countries. I could give you a rough idea of how US-based equipment will work here but you may have to do some googling to figure out how UK stuff will fare.

But... isn't furniture included in your package? It should be. Depending on how long you're here, it's usually cheaper to rent heavy items than to ship them. Maybe you can make a deal where the company picks up the rental for a year and, later, if you decide to stick around longer, you buy the stuff you like at the end of the rental contract. I picked up two excellent bookcases for $10 (US) each that way. In the case of a television set, you have a strong negotiating stand, in that your existing set, if it works here at all, is not likely to work very well.