It's quite interesting AFTER THE EVENT that so many opinions are brought forward about flying old aircraft, ejector seat cartridges etc etc.
Basically, Mr Hill commenced a looping manoeuvre at too low an altitude to complete it safely.
We all know that. The problem is nothing to do with ejector seats - it's to do with airline pilots turning up at air shows expecting skills that they once had - and practiced regularly (weekly in the season) to still be there.
They aren't - and until the CAA stops this blatant abuse of the 'old boys ' network , such events will happen.
If you want to fly a Fast Jet as a display pilot - look at the requirements of a serving officer. 10 hours on type in 2 years - I don't think so.