As there was usually a 'hold' between completing the Gnat course and starting at TWU, we were given a short Hunter refresher course of around 20 hrs at Valley before starting at Brawdy.
In my case, I finished my Gnat course on 4 Jun 1975, then had an interesting detachment to Wildenrath in July and August before my planned Hunter refresher course at the end of September. But after 3 sim trips I was told that someone else needed my slot, so I went back to hold with 2 Sqn 4FTS, scrounging 18 hours of sandbag time until my Hunter course recommenced in mid-November.
I went solo on the GT6 on 9th Dec, but the course was mainly dual so I only had 3 solo trips before it finished in early January. Then solo again at Brawdy in the F6A a couple of weeks later.
The long Hunter course was indeed mostly for foreign students and those too big to fit the Gnat, but the short Hunter refresher was for everyone except those creamed off to be Gnat QFIs.