I agree to the last few posts, dont just give up in google, phone around, i must have phoned about 6 or 7 places before a very nice man at NATS in Swanwick gave me the email to the Birmingham ATC, which then produced a telephone number and voila an awesome visit was organised. It would be too easy to just give you a list of numbers!!
Having said that, it wasnt even mentioned by the interviewer and I was offered a place! (But I did mention myself just to be a bit keen!!)