To my mind, this is a terrible waste of paper and energy, when they could just as easily give you that information on the computer screen. Only if you want. If you're a computer major, or play with computers a lot, or design web pages, it would be a good idea. If you do decide to bring a computer, I highly recommend bringing a laptop if at all possible. Laptops are infinitely easier to haul across the Atlantic, and can usually handle the British electricity more easily than their desktop cousins.
Laptops just travel better, that's all.
I brought one, and was glad I did. You will need an adapter for the electrical outlet, which is a different shape than you find in America. If you are planning on using a modem, you will need a phone cable that has an American plug on one end, and a British plug on the other. These are available in Lancaster, at a shop in the City Centre called Dixon's. Dixon's is a British electronics store very similar to Radio Shack.