Trevor, Colin MacGregor features in the Arthur Siddall albums, I will find and separate a photo of his car or cars and post later. [ 5;12 ]
Later 5;35 ; only mention of a C MacGregor is driving an MG Magna - no Special that I can find so far.
Cheers
Roger
Later again - a day later;
Have put up a post about about Jock Aitken and his Special(s), as understand he built two.
There is a comment in the Vercoe Book, that McGregor drove Jocks first Ford 10 Special when it was owned by Arthur Cowper in the 1950's