Back to the boat.
Built as a MKII in 1970, she has subsequently been converted to a MKIII. As I understand it the key differences being solid beams, trampoline, rolled decks, forestay bridle(?) and metal bar at the bow. Looking at the pictures he has given me, she has additional internal stiffening when compared to PeterV's boat and the gunwhales or rubbing strips have been removed.
First picture shows her as a MK III. Most of the pictures in this post were taken by the previous owner.

Note the hefty un-tapered swivelling mast which has quite a pronounced aerofoil section.
I don't have a date for these two pictures but Seabird (419) is still in MKII form and 510 (MK III) must surely be close to the end of production. I don't know when the Swift Association faded away.


For those who may be interested the next pic shows conversion work close to completion.

This is how she looked recently, still in use but in need of some 'fettling'.

Deck layout shows jib sheet 'out hauls'. Would you call these barber haulers? They may be too much of a good thing.

And finally back in the garage, I deny coiling ropes.

Although I have read a little there doesn't seem to be too much around about Roland and Francis Prout. I did read somewhere that they were Olympic kayakers and that their first cat was a couple of kayaks lashed together, the start of a lot of innovative development in the field. I spent an afternoon in my youth sitting on a Sheerwater getting wet, this is the limit of my cat experience.
Many thanks again to the previous owner who I hope will follow this thread.