Hi Dan,
I'm a member at Canterbury and play whilst i'm studying in the city. Unfortunately i haven't studied the history of the course a great deal, it is certainly a Colt design, although there's no doubt that it has been changed by committee's throughout the club's history.
I would be happy to host if you are in the area, a round at Canterbury combined with an afternoon exploring the city and seeing the Cathedral could make for a great day.
Regards,
Tom