The Balliol! I wish I'd been able to have a go in one. A Merlin engine (lots of torque) and a short wingspan reportedly meant very scary fun from full power at low speed.
I knew one ex-pilot (Jim's now sadly no longer with us) who changed branch to navigator after very badly scaring himself during a low-level night go-around in one. 720 degrees of roll, out of control, over the threshold in the dark would have put quite a few others off, too.