JP 4 also had the manual winding canopy and was easily the "hottest" JP - and for curious reasons the only JP type I ever flew. (Fleet running out of fatigue - Syerston running down - brilliant connect by a bean-counter).
It was also cleared to fly (with some limitations) with canopy open. Was bashing the circuit on a hot day with QFI Ken Tait - subsequently Red 10 then later sadly lost in the Bucc that broke its main spar - when he decides we should do a coupla circuits with the canopy open.
Absolutely brilliant! And made even better by ATC enquiry:
"C/S .. is your canopy open??"
quick as a flash came KT's response.
"Standby tower ..... we'll check and call you back!"