Along with a few others, I did an "experimental" Primary course in 1968. We did 60 hours Chipmunk at Linton with the RN HSP (pre-helicopter) Course, which included 12:30 solo (a pretty good ratio - better than PFS - of about 21%). All - with a lot of ground school - in about 5 months (8th July to 22nd November)
We then joined a (shorter) ex-UAS Course at Syerston on the JP. Oh, and just to completely muck up any comparisons/conclusions, we (the non-UAS bit) only flew the JP 4, on which I did 141 hours (probably should have been less - there was a LOT of flex!), which included 42:30 solo (30%!). And that lot took 8 and a bit months; 15th December to 28th August.
Chipmunk to JP4 was a sporting transition - kind of 11+ direct to A level........
But somehow I went solo after 6:30 dual - the quintessential frightened teenager!!