Forevertraining - Drop your very best CV to the address so helpfully given by Vent.
They do actually keep any decent potential applications on file - I know of at least 3 people in the last 3 years who have sent speculative applications, all at some point have been interviewed, and one was offered full time employment (as a fully qualified atco).
You may find that they now prefer to employ locals as ATC assistants, (they get financial assistance for further ATCO training from the local enterprise agency if they do), although they won't know who you are if you don't apply.
One way round that may be if you know someone who lives in the area, and they agree to let you use their address as a postal point of contact, not entirely ethical, but it shows initiative!
All the best.
