I’ve just picked up on this thread as I am doing some research for a friend making a model of one of these tankers. The Superfueller was known as the “Python”. One was surviving at the BWOC Depot at Weston-Super-Mare, but they advise me that it went for scrap about two years ago as it was rusting away. Here is a colour photo from my archives taken at Heathrow in March 1962.
I would also like to know how many were made and if any still survive?