since your in the UK it's kinda harder to find things...
heres a nice microsoft set, though its a little pricey...
If you can find a G11 or G15 keyboard by Logitech, those are nice... (G11 just doesn't have the screen, but I rarely use the screen anyways)... and a nice mouse is a Logitech G5 (not wireless), or G7 (wireless) but the wireless one cost a bit more, but also is nicer. Hope that helps...