@Uberuce - yes, that was me you saw yesterday. I was on my way back from a trip round the shops of the Bike Quarter (starting at EBC, then Velo Ecosse and finally Bike Trax) in search of a set of child-sized pedals with a 9/16 thread because micro-Greenroofer needed a new set (his sister having trashed the originals). Many child-sized pedals have a 1/2" spindle, so you have to be careful...
I had an interesting chat at Bike Trax about this new Brompton fitment I'm keen on: a plastic tube that fits in the seat tube and stops your saddle at just the right height every time. New out, but not yet in the shops.
Heading home I passed a chap on a green Brompton on the towpath. He was shepherding a girl on an Islabike, and I made some admiring comment about his family choice of bikes.
Fitted the new pedals today: well received by the client. I wrapped the thread in PTFE plumber's tape: I've read that it's a way to stop them seizing.