Correct, it was wired so that the two leads from the 2 pin plug were in effect performing as a 'switch'. Used it to test for continuity. I once threw the leads on the bench [never bothered with the isolator] and they touched some wire -wool which ignited and made a mess of the plastic botttle of white spirit!
Yes the switch is an old dp Wylex
The board was lethal if you did not know what you were doing; and just dangerous if you did know what you were doing!!!! All fed via a 13A fuse in a plug; RCD?...never existed when this was made. It got repaired over the years, which explains why some of the accessories are newer.
Just been clearing out my workshop at home to make space for a new to me [free] lathe and come across;
a switched MK 13A plug
a 'sleeved' MK 13A plug, where the sleeves retract over the outside of the pins
a 'fitall' plug, which when adjusted correctly will fit every socket that UK used touse [except Wylex type]
I will post some pics when I have time
