Ah yes, the Collier problem. Sadly folks visit his website and assume that all the information it contains is totally accurate. Instead, it's a site that has information about 'proposed' books or books that are in the course of being compiled and is aimed at other publishers with a view to printing co-editions in other countries. The GT40 book is an idea being discussed, based around a large number of photographs I recently acquired. With luck, the book I have in mind will happen but a lot of things have to fall into place first! And I need a lot more photographs of genuine and replica cars! Any offers? (I did spend a day at Mallory recently with the Gelscoe GT40 - watch out for Motor Sport magazine....)
Regarding the four GT40s that went back to FAV, there was a rumour that some of the paperwork was not in order, but also the GT40 was on the way out in 1966 as the MkII took priority and the MkIV was the next weapon of choice. Shelby had no customers for them. Some parts were cannibalised to keep other cars running but SAI had no requirement for them - they just sat there costing the company money.