I guess the technology wasn't good enough in those days?
Please forgive me for the childiness--couldn't resist. 
The perils of changing syntax mid-composition!
Thanks Genghis.
Any reason why they went down the BMAA route; I was thinking of going down the BGA SLMG path.
BGA hasn't got a working system for oversight of amateur constructed aeroplanes, and the factory aren't approved for building CofA motorgliders. So I don't *think* that route is open to you.
BMAA has a working amateur built-approval system, similar to LAAs, and about as active. They also had prior knowledge of SLMG-like aeroplanes in the Chevvron 2-32c. Also, the aeroplane has a weight and stall speed that make it a microlight. LAA would also be open, but personally I believed then, and believe now, that for microlights, and particularly for "factory kits" BMAA offers the better system.
G