Classic. I once had a student black himself out doing a slow roll - he let the nose drop in the inverted and pulled just shy of 6g on the recovery. It would have been more than 6g but for some 'assistance' in the opposite direction.
Re Southport, that appears to be luck rather than judgement. You would need the right photogrammetry software to go for anything more specific than "appears to be", and I don't suppose many Ppruners have that.