My advice would be to buy the iet code of practice book that walks you through what to do. I did the course and it was basically reading through the book. If the customer is paying in full, no additional qualifications are required.
And the cables are insulated and sheathed (twin and earth), not singles.
As mentioned previously, there will be a fitting on the conduit at the top of the switch drop (a tee or an elbow) that you can remove with a screwdriver. There used to be rubber bushes available to go over the end of the...
You're correct, the only way is to disconnect the cables and do and end to end continuity test.
It is permitted to have 2 ring cables and a spur cable in one circuit breaker, so long as the termination is secure. It's the same as spurring from the ring final circuit at any other point.
By standing on the soil you'd probably be wearing shoes that provide some level of insulation. Touching a metal pole with bare skin will give a lower impedance to earth. Also it would be a case of resistors in parallel so the two paths combined would give a reduced total impedance to earth.
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