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You need to seal around the edges and joints in the PIR board to prevent moisture laden air condensing on the cold roof surface above. Either foam sealant from a proper gun (~£20), don't bother with the aerosol cans, you will spend more time cleaning up the mess as they are nowhere near as...

Toggle fixing? https://www.screwfix.com/p/easyfix-spring-toggles-6-x-80mm-20-pack/1936x

Phosphoric acid, available as commercial kitchen descaler for bain marie's etc. Supposedly food safe.

Your system flow return temps. where 65 flow and 40 return with one boiler running, this suggests that one boiler is not sufficient to meet the heat demand. I'd have thought 40 deg is a bit low for the return temp. Could possibly be down to very low flow too?

This product worked well for me: https://www.insulationexpress.co.uk/marmox-multi-board

You may need a new tile cutter too?

Its likely be the mains suppression filter block giving up. Cheap and easy replace.

The DNO calcs. for new supplies to UK domestic housing: UK Power Networks would in general expect the (ADMD - after diversity maximum demand) for a gas heated flat/house to be between 1.5kVA and 3.0kVA and an electric heated flat/house to be between 5kVA & 10kVA unless abnormal high usage...

Dehumidifier?

4BA ?

These may do the job: https://www.screwfix.com/p/suki-levelling-foot-m10-x-80mm-2-pack/701GX?tc=YT3&ds_kid=92700046986170840&ds_rl=1241687&ds_rl=1245250&ds_rl=1245725&ds_rl=1245250&gclid=Cj0KCQjw3s_4BRDPARIsAJsyoLMNfP0-2FZg4iGtwqW8rfdNIQ2gWIJ3CWMuFjS9XcsLfPeGg2n9ypsaAhTOEALw_wcB&gclsrc=aw.ds

Similar size to the B I believe...

Electric ceiling heating pads, probably/hopefully disconnected as it is a poor method of heating a room cold feet/hot head. Developed by ICI as "Flexel" IIRC. https://www.fenixgroup.eu/de/node/3465

It is likely that the manual credit switch is wired in parallel with the coin slot switch. If the coin slot switch was electrically stuck on this would render the manual credit switch U/S. Try disconnecting the coin slot micro switch (one of the two connections will suffice) and see if the...

If it is a Bosch/Neff unit then they normally have an adjustment screw at the front that raises/lowers the rear of the machine. It may have been raised until the top is binding on the underside of the worktop.

If a DB25 connector is too large, would splitting into two DB9's work? A bit of work with adhesive lined heat-shrink sleeve should help with the cable integrity.

Soraa manufacture some well engineered LED lamps, with beam angles down to 4 deg. https://www.soraa.com/products/24-AR111.php GU10's are available down to 10 deg. https://www.soraa.com/products/19-MR16-GU10.php#

You might try: remove the motor give it a good wash out with brake cleaner followed by a good blast with an airline. It may just be carbon deposits from the brushes providing a path from live parts to chassis.....

That "twang sounds very much like the behaviour of a pressure relief valve and NOT a bypass valve? Has it got 6 Bar or similar printed on the plastic part anywhere?

The fridge in combined fridge/freezers normally pulls cold air up from the freezer with a fan, the fridge thermostat will control this fan. A warm fridge is often caused by the evaporator in the freezer icing up and restricting the airflow into the fridge compartment. De-ice the freezer...