Yeah, i have the Miles Wilkins book, and as mentioned in previous posts on this website, it is'nt 100% accurate. MK 1 cam covers(not rocker cover,OHC not OHV)= blue, SE= green, MK2 pre 68 same cam covers as MK1 but plain, aluminium finish, post 68 cam covers have Lotus above timing chain on the front of the cam cover, and also plain aluminium finish. Just flick through the Lotus Cortina gold portfolio at the articles on the car when it was new.