aw ditor, given the very small number of pilots under training these days, compared to the times when the UK could afford an air force worthy of the title, I doubt that there'll be a lot of crowding.
4 FTS used to operate 2 Gnat squadrons, plus a Hunter squadron, with a far greater number of aircraft than the Snake Oil Flying School will operate.
I suspect that mixed circuits and the delightful Anglesey weather factor might be rather more of an issue than the actual numbers of aeroplanes at Valley.