If I remember rightly, large round 3 pin 15A, small, round 3pin 5A and small round 2 pin 5a (unearthed). for a while some even mixed these with square,3 pin 13A. What a mixture. My dad had a thing about mucking with electricity and blew the board's fuse several times. One time (in my teens by then) I found that he had managed to wire into the live side of the electricity companies main switch!
Correct. and their was also a little used 10amp 2pin, and 2amp 3pin