biddedout, there was a nav cross-over system a few year ago but that was to address a pilot shortage. With the cancellation if the Nimrod, draw down on C130, withdrawal of the Harrier etc that is probably not the case now.
To stop recruiting for a year is not the answer either as there needs to be a range of recruits of a given age. If you re-tread all 25-30 year olds you would increase the average age and create an age gap that would bite in future years.