Thanks to all of you who have provided so much information.
It looks as if, like Charlie, I may have been trying to undo at least some of these buttons the wrong way! Goodness knows how many I may have missed because of this - probably none to be honest!
Interesting hint about the fixed shank, something to look out for in future, although I doubt I will be lucky enough to find one of these fascinating buttons.
Presumably the aircrew and so on who used these knew which button on their uniform was the 'escape button'. I'm guessing it would have been something like the second button from the top otherwise they would have wasted a lot of time taking off a lot of buttons and testing each one!
Roger
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