Hi Marc,
I've just started fitting Dingham couplings to my 4mm model railway, and I found your site when I was looking to buy more. Can you tell me, please, whether your Flippems are compatible with the Dingham couplers? If they are, I can continue fitting my Dinghams, and then wait until the 4mm Flippems are available. Otherwise I shall need to stop the existing conversions and hold off until the Flippems are available.
Many thanks,
Glyndwr