Set out for some hard core bike shop frittering on Good Friday, and as well as new sunnies (too posh to name), t shirt, jersey for daughter, saddle for son (insisted he needs it, and it was only a fiver), I bought some MKS folding pedals. They're very solid, quite heavy and deeply cool-looking. These will be attached to the Brompton as part of the pimping project, or possibly attached to son's/wife's/my MTB to steamline shed space. Thinking about it, I could buy an equivalent non-folding set and mix the two sets to create a wider space down the middle of the shed, which would be progress in anyone's book.
(If you want to follow me down the path of folding pedal enlightenment, Action Bikes In Wimbledon had two sets. I bought one, so there should be the other one left for you - I don't think they're a fast moving line given the state of the packaging. He's got them marked up as Was £35, Now £XX. I got mine for £20 after a bit of haggling.)