I see that you reside in Eastleigh, you have a NATS unit right on your doorstep, at the airport. Give them a call (02380 627189) to request a visit, as long as you have a current passport (for security ID) they will most probably agree to a visit. If you can speak to one of the controllers, I believe that he is known on the unit as "Uncle Billy", he has helped numerous sucessful interviewees. He helped a very good friend of mine, who subsequently joined NATS.