Hi, I found a profile of the Ardua builder Les Aylott in the 1975 Autosport annual. It describes a little of the building of the cars and the various marks.
It can be seen here
http://pbpb.fotopic.net/p68511547.html
I saw the car race at Ingliston in 1974 and recall it had very home made look,
nothing like the latest version.
There is another pic of the car at Ingliston here
http://www.ingliston-circuit.co.uk/p...liston_10.html
on Iain Niclsons site
Hope this is of some help, Cheers Ian