SB:-
I find a couple of the arguments a bit weak to present to such a high powered distribution.
Fair enough. Would you please explain? Also I find your comment "a bit weak":-
I am sure the Mk 10 seat and the Mk9 in Jaguar were considered legacy systems
The Hawk Mk 10 seat had no safety case, rendering it unairworthy. No "legacy" consideration can accomodate that!