Quango,
i don't know of any contacts but would have thought a simple look through the phone book or even a trip along to the airfields may be of help.
I would suspect most of the work available to you at your age will be limited but they always enjoy having enthusiastic people around them.
Another idea is to join the Air Training Corp and get some flying experience in through the VGS, that way you will also get to see another aspect of the work which will definitely go well on your CV when you eventually apply.
The larger ATC units do not have any real work experience that we can offer you although many are happy to host visits by students