OK - so answers came there none! I've tried fitting the gasket both ways, and have come to the conclusion that the gasket is meant to go between the back-shell and the bodywork. The outer chrome ring seems to fit round the plate that has the "bayonet" holes in better without the gasket right up behind it. The other thought is that the bayonet plate is brass, so won't corrode if a bit of water gets in behind it, whilst the back-shell is steel, so needs the gasket to separate it from the aluminium bodywork.
So that's the way I'm leaving them.
Mike
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