In 1970 I was lucky enough to get onto a low level nav course at Linton on Ouse flying JP 3, 4 and 5s. These last had just been delivered and had less then 10 hours in their F700s We were each allocated a pilot for the course and I was lucky enough to get a South African pilot called Al Colesky. Al had previousy led the Linton Gin formation team and he was keen to introduce me to the mysteries of aerobatics. On my first flight, which is in my logbook as "aircraft famil" , Al said we would skip the boring stuff like straight and level, and go straight into some aeros - thus it was that the first manouevre I carried out in a JP was a loop, which Al was kind enough to say was "not bad for a first effort".
Great fun, although what use the course was to me I couldn't see, as soon after I was on tankers, where FL 250 was about a close to low level as we ever got!