Just saw the note, and thought I'd better try to find out more - I know one of my '22's was passing through Sywell today!
I just heard that it was an instructor with a trial lesson on board. Apparently it was dynamic rollover. Also, so I was told, the student wasn't put off by it at all, and signed up for more lessons.
...all received 2nd hand, as is often the case in these situation, though it was from a trusted friend who just landed his 109 next to the wreck.
Beats my story - right after my trial lesson I got out of the '22 and threw up on the ground, but still went back for more....
P.