"What does the refresher entail ? I can`t see how you "refresh" on what is a different jet ?
Well back in the days when there were no dual carriageways on Anglesey and there was just the one road bridge over the Menai Straits, Valley had high performance swept wing supersonic aircraft rather then the JP Mk 6. When you finished the Gnat course you held for a while, then did a 'refresher course' on the Hunter. Including the RAF's hottest ever Grunter, the wonderful GT6!