Way back, before Pontius had even gone to Biggin Hill, basic training from Day One was pure jet. (JP3 and 4). As I understood it at the time, the failure rate was considered too high and too expensive. 1968 or thereabouts, a short (12 hours?) course on the Chipmunk was introduced. The aim being to weed out those who could pass all the stuff at Biggin, but couldn't fly an aeroplane. Luckily I went the all-jet route, not flying a Chippy until over nine years after "wings".
Oh, and I doff my hat to you Mogwi.