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??? Video shows drip from the clear hose. Anyway it's from an faulty auto air release valve which requires cleaning or replacement.

^^ +1

heating pipework undersized or incorrectly connected to emitters +1 Unlikely to be boiler problem.

Can't help but think the answer is in the question..

Then Then, if you have a 3-port or two 2-port motorised valves, the system has probably been miswired.

You can imagine whatever you like.

Picture of the whole mixer showing both sides, please.

This. High and low so that theres a circulation of air.

Quite agree.

Very much the responsibility of the gas fitter who worked on your cooker pipework to have relit the back boiler pilot, or at least made every effort to do so. Your back boiler may be due a good service and possibly replacement of a couple of inexpensive parts but is most unlikely to need...

"I think this is a simple question." I count five questions in the above post. Answers in order; various,yes,no, yes and yes.

https://www.screwfix.com/p/essentials-brass-cistern-lever-arm-75mm/4912r

If you're pumping away that hard your syphon washer needs replacing.

The air tube(s) in question will be to the push-button second left from the shower handset, not the one you're looking at.

Link wire between 1 and 2, or both wires together into either 1 or 2. Proper way; involves tracing cable to point of origin (usually a wiring centre), linking there and then disconnecting/removing the cable run to the stat. With the cable dead the stat can be safely removed.

Bridge 1 and 2 (red and yellow) or: simply leave the stat permanently @30 degrees (Less lazy options are available)

https://copper.org/applications/plumbing/techcorner/problem_embedding_copper_concrete.php

Would it be too simple to fill a bucket from the tank-fed supply and chuck it down the bog on the rare occasion that the mains is off??

Your best source for advice will be showerdoc.com See https://www.showerdoc.com/sirrus-ts-1503-thermostatic-shower-valve-shower-spares?srsltid=AfmBOopjGhzg2YTrnZHKq0tm4XQoMhyiBmA0DgI2ovjZVT2jsxAvw5UW

As above, simple reset is probably all that is required. https://cdn.expertelectrical.co.uk/media/catalog/product/t/p/tp5000si-instructions.pdf pp24,28 If the unit has failed (less likely but possible) put a link wire between terminals 2 and 3 on the backplate as a temporary override. T2...