V154,
Did you receive any feedback about the reasons behind your failure? Have you got a local airport/flying club that wouldnt mind some volunteer help?
Have you or would you consider a visit to your local NATS unit and one of the centres?
IME the more you show an interest prior to interview the greater your chance of success. The board are not looking for ATCOs trained, for the use of, but well rounded individuals with a real interest in aviation.
Good luck for the future.
