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I've never seen a bending block or know how to use one being a youngster :Blushing  Do you know of any videos as would be interested to see it work?

We aren't all rough...I'm sure there are some rough sparks in Ireland as well?

what two port valve has been installed? Sound like cylinder thermostat is working correctly so I bet the valve hasn't been unlatched (some valves do this automatically when energised and some don't) or the micro switch is stuck between grey and orange.

spot on...The purpose of an RCD test is not to establish the integrity of the circuit as this should of already been done if the correct sequence of tests have been followed. I wonder If the people who carry out RCD testing not at the RCD itself  do so at the extremity of the circuit and record...

Then you could end up unnecessarily chasing your tail for no reason.  

yeah agreed :Salute

hold/clamp a piece of timber under the existing hole and put a longer pilot bit in the arbor.

sounds like help-link.

I've recently had a right PITA job due to dryliners...19 flats All electric heating (6 rads in each flat) so radiator positions supposed to have wood put in the wall none what so ever. Cables left in walls and ceilings, trapped cables, cables pulled through at random heights even though clearly...

RCBO sounds fine to me. 20ms is the result you should record on the schedule of test results. As Rob the rich has pointed out there looks like a loose connection on the neutral or trapped insulation as the r1 and rn readings should be within 0.05 of each other.

So it tripped at 20ms when the load was disconnected?

I've seen neutral earth faults that stop the RCD from working correctly and also stop the test button from working. Ideally it should of been tested with the load disconnected as something plugged in could cause noise or if there is a capacitor or something of the likes could produce readings...

some of the ways mentioned will bring the lights on for a few seconds when timer kicks in whilst the photocell decides if its day or night. Best way would be to use a something like a box timer that requires live and neutral to power the time clock. The timer side would be a volt free contact so...

and another thing why do you need to override key switch? The timer will normally have an over ride function.

Blimey bit long winded  :innocent  just wire the over ride switch in parallel with the switch live from timer/photocell.

look above.

For work on an existing building that did not comply with the applicable requirements of the building regulations, the building must not be no more unsatisfactory in relation to the requirements than before the work was carried out.  

Even if it wasn't PME the minimum CSA of the bonding conductor would have to be 6mm copper so if using the armour as the bonding conductor it would have to still provide equivalent conductance of the 6mm copper conductor. 6mmx8.5mm=51mm, so the armour would have to have a minimum CSA of 51mm...

Just given you a scoob :Salute . I cant remember the ratio off the top of my head but using the ratio phoenix provides in post 34 of 8.9 and using the pdf you've just posted then a 95mm 2core armoured would provide equivalent conductance if a 10mm copper bonding conductor was needed.