Sas, where do you get the 75%/15% ejection seat figures from?I can`t believe your man fromM_B would be happy. as I think you would find that there has not been a seat failure in the RAF/Navy,or of the Folland seats in the Gnat.By that I mean if the seat has been triggered it has worked/operated. If the seat has been operated outside the Parameters for a Safe ejection( ie pilot alive) then that is a different statistic, and should not cloud the reliability issue.There have also been many successful ejections outside the limits as well.
Also, in the civil accidents, the seats have worked, but in two instances were outside the parameters for different reasons.
A recent accident to a German Alpha-jet in which the crew were killed may lead to a revision by the LBA, if it was true that it had to have de-activated seats, and it had been a surviveable accident.( my speculation, based on brief info. only)