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If you have a RFC or radial FC with nothing plugged in, it is still classed as a circuit. How is the above any different?

What do you think is a "certified electrician"? That's really not a UK term. If you want help from a known "certified electrician" best employ one.

YES YES - there should be no bare copper showing outside the terminals Probably OK - you should be able to see where the short was as there will be black marks and/or pits on the metal. Yes, as noted in posts above - but if there is no excess copper exposed on the L & N connections there is...

I meant with dry contacts!

Looks to me that the contacts should be connected to 19&20. 21&22 for obstruction detection switch.

Nothing Fein MultiMaster or equivalent with a carbide tile cutting blade couldn't handle. Wear goggles and a mask.

OR is still installing overhead fibre all round here...(S London), in competition with Community Fibre

Just noticed where you are!

eh? Your post above seems to be.

At least one other make is available: https://www.screwfix.com/p/ideal-lever-wire-connectors-30-pieces/275jk https://www.screwfix.com/p/ideal-32a-3-way-push-wire-connector-100-pack/56118

In every house I've ever been in in the UK it's been down for on on light switches

Yes, but if you turn off all RCBOs AND MCBs surely nothing works? If something does then you have a similar problem!!!

I know - but it doesn't - it IS a parallel path to earth, even though that is not its intended purpose. The electrons don't know the difference. The question was "Once the bonding is connected, if the gas pipe is underground does this act as an earth to supplement the existing earth from the...

Generally it will. It's a parallel path to earth so will reduce Ze. That's why you disconnect the MPBs when measuring Ze.

There appears to already be an RCD in your CU - the module on the far right of the photo. Iooks to me as if it has an IΔn value of 0.03a marked on it - that makes it a 30mA RCD. That's why we need a better photo - we need to be sure what is in the CU, and if that module is an RCD, to help you...

What's that on the far right, with a trip rating of 0.03A? Please can we have an in focus photo showing the whole of the CU so that all devices are fully visible?

Read the specification.

It's perfectly OK to have insulation between the rafters provided that there is an air gap between the insulation and the felt with eve and ridge vents to allow airflow between the felt and the insulation, plus provision for ventilation of the loft space.

They are generally used to supply an item of fixed equipment. The questions are which circuit in your CU are they fed from and what are they supplying. You could turn them off in turn and see what stops working.

Switched fused connection units (FCUs). Do you or did you have electric heaters/storage heater or anything similar? Is there any indication in you consumer units (CU) of circuits for something like that? If you post a photo of your CU with the flap open it might give us a clue.