We did a boom run both dual and solo on the proper swept-wing trainer, the Folland pocket rocket. Up to FL400 under 'Western Radar', roll inverted and pitch to 30 deg nose down, then roll erect and hold 40 deg. Watch the IMN, no drama, explore the control feel in pitch, then roll left through 300 deg and recover right to S&L. No wrecks, nobody drownded, nothing to laugh at at all. Except for one chap on the course who cocked up the rolling maneouvre and pulled through achieving some colossal IMN value until he recovered at about FL100!
Then a boom run on the Hunter refresher course; even the GT6 wasn't as keen to go supersonic as the Gnat was. Whereas Puddy took me to M1.2-ish in the T7 on an airtest after looking for the Irish ferry - before slowing down to well below 100KIAS with lots of buffeting and general excitement as we were checking out a reported aileron issue.
Whereas the Hawk (or JP 6 as some termed it) had nothing like the pleasant transonic handling of the Gnat / Hunter. Directional stability was a bit weird too, although we didn't have the extended fin trailing edge fillet when I flew it, so that might have been part of the issue.