Most XP machines show both installed, make sure the UK one is set as Default INPUT device though. Its in the Control Panel, Regional Settings, Language (then the details or advanced tab at input device)
(hide) If you want to play a game with an opponent of a similar level, you can define a required BKR range for a new game invitation. Then nobody with a BKR outside this range will be able to see/accept it. (Katechka) (show all tips)