I have found there are 4 types; ATE and Girling, early and late of each.
All I know is they are the early ones (square pads) but no clue which of the two types they are. No markings are visible as they are so rusty.
Been googling and came across a few threads on the subject where people seemed to be arguing over which of the two types they had!
So can anyone tell me definitively what they are? The van is a 1985 registered (Built September '84) by by the way:

