Just been having a read through a hard-cover edition of the Handbook to the 1961 Electrical Wiring Regulations that was given to me by a guy at work.
And I must say there is some rather strange stuff in here.
For a start, everything is in Imperial measurements, there are capacity charts for wooden casing (trunking) for use with VIR insulated conduit wires and there is copious mention of Permits to install Electrical Wiring. [Linked Image]
Anyhow, I thought I'd get a few pics of the diagrams used in this text, you guys in the UK may have seen some of this gear before:

[Linked Image]

[Linked Image]

[Linked Image]

Sorry about the quality of the pictures, but I should have used a scanner instead of using my Digital Camera.