Just listened on iPlayer to the above prog from Radio 4.
Fascinating stuff about the man who designed the E Type; also included interviews with Mike Kimberley who worked with Sayer.
His methods are all explained. He certainly wasn’t a designer who sketched it all out on the back of a fag packet.
Well worth a listen
I caught that, particularly liked the bit where he mentioned how much of a waste of (lap) time the spoiler is on an S2 Exige 
haha