There are no RCDs on a standard 1106. Unless they are stand alone global ones on the tails.
Indeed, when RCDs started to become a little bit familiar (some folk had plug in "powerbreaker" adaptors for things outside - mowing the lawn) and had started to appreciate the possible safety aspects of an RCD, a DP RCD was available in its own housing and was used just after the fuseway outgoing from a rewireable consumer unit for just one circuit or prior the tails for "front end" protection.
It was a while before the advent of the "Mainswitch" on a consumer unit being a RCD, being front end.
Then the RCD evolution started a bit later.
RCBOs were a long time coming (and very expensive).
The 70s then 80s then 90s was a time of change,
I started my apprenticeship, and finished it in the early to mid 70s .
The 14th Edition of the Regs was the "New Kid on the block" for long enough and BS7671 was a long way of being thought of.
70s music was the best too, closely followed by the 60s.
Perhaps I am biased though, proper swearing was almost unheard of until the shock of working in a factory and drugs were almost unheard of too 2 or 3 you knew who they were and the kept themselves to themselves.