I am in South Bedfordshire. In times long past (and maybe again), I used to travel to London on a daily basis... I also have a spare bike-box which would rather was used as intended than torn up for recycling.
Yes I've got a M Wave alloy pin in silver, 34 cm end to rails, 28 cm limit mark to rails. If you're interested send me your email address and I'll send some pictures.
Does anybody know of this frame builder? I can find precious little about the company on the internet, but I have just acquired a Marlow tandem.
It seems to be built from a quality tubing, probably 531, although with a seat tube diameter of 26.6mm which would appear to be a metric 531 size...
I've got a spare lever, unused, plus the fixings, some of which are used some aren't. £10 if you're interested:
http://www.flickr.com/photos/39502815@N07/5445799219/
I'm fairly sure I've got a single left hand braze on lever (new old stock) and a set of clamp on levers. I'll have a look tonight when I get home. If you send me an email address I'll send some pictures.