Saman......
I worked at RAE Bedford during 1973/74.
I have a copy of the book 'A Short Illustrated History of the Royal Aerospace Establishment Bedford' by Arthur Pearcy.
An excellent, copiously illustrated book with plenty of photos of the SC1. However I couldn't find anything resembling the Hastings/Comet photo you mention.
By the way, the ISBN number is 1 85310 360 8