Approx 20 years ago when I was in need in a new No 1 titfer (the original one had done many hours stuffed down the side fuselage of a Shacklebomber) my friend's wife was working in clothing stores at RAFC Cranwell. She would phone us up when the latest round of recruits had been chopped and handed back their kit. A quick dash to stores, try a few on and paid £30 (?) for one that fitted the best (I had to have a haircut each time so it worked out well). Still have it gathering dust on top of the wardrobe.