Hi Sean,
Very many thanks for the info, and I would really welcome the chance to have a look at the stuff you have on the M2, and perhaps chat face-to-face to pick your brains, if that would be possible? I'm quite happy to travel to wherever you are based, as long as you can put up with me pestering for information
The RE Museum is closed until 27th May (so not long now) and I plan to contact them as soon as they open again. I always like to take lots of detailed photos and measurements when I'm researching a new project. I had heard of the two at Rudders Boatyard, but these look as though they might have been 'modded' a bit...
Steve