blanking plate

[Dave A]

Another example is old houses that have no EL on plug circuits, that is acceptable in terms of the CoC unless you add to or modify those circuits in anyway then they become subject to the current regulations.

Incorrect. Amendment 8 introduced the requirement for an earth leakage unit protecting circuits containing socket outlets in Section 5 of SANS10142-1. Some fine print applies, but you can't accept the lack of earth leakage protection purely on the basis that "that's the way it has always been" anymore.