Langley B - I know exactly what you mean - I am a Martin Baker "customer" and from what I know of the MB culture I find it hard to believe that they knowingly exposed anyone to risk. Two failures contributed to Sean's death as I recall the SI. One - the undesired seat firing and , two, the failure of the parachute to deploy and we don't know which is the alleged failing. I suspect that it may be to do with the design of the seat pan assembly which allowed the pin to be inserted without making the seat safe. We will have to wait for the details I suppose.
I still love 'em all!