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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...

The Rothys are good. Likewise pretty much anything from Knipex, Nerrad and Bahco.

https://www.screwfix.com/p/floplast-wc07-universal-compression-waste-straight-coupler-white-32mm-x-32mm/15490 or elbow

Is the correct answer!

In a word, no. You need a press gun with the right jaws for the fittings. The fittings are specific to the pipe. You might ask Roth who stocks their "Laserrohr" local to you, and then ask that stockist who buys that piping system. That person will have the right gear! Most plumbers won't...

AFAIK what you're trying to do can only be done with Vaillant's own proprietary controls. Happy to be corrected if anyone has achieved this using third party kit.

Gimp

As correctly stated above : Black tank is F&E for the water that circulates through the rads, boiler etc. The water that comes out of the hot taps is stored (cold) in in the top part of the fortic, above the annular indentation 2/3 of the way up. OP - what's that top bit of the fortic look...

They last a lifetime!

One of these may help: https://www.screwfix.com/p/adjustable-basin-wrench-13mm-40mm/868xr FWIW installer will have fixed tap to sink before fixing sink to worktop.

Are you missing one of these? https://mcdonaldwaterstorage.com/product/alloy-combination-tank-lids/

Some info, may be relevant to your specific boiler and setup. https://viessmanndirect.co.uk/files//f814ea2a-5b56-4feb-9166-a43e00f71548/WB1B%20Compact%20Outdoor%20Sensor%20Instructions.pdf?srsltid=AfmBOoq4eudAQtJ9P-ie5EtZlJjGAXusjBXmU7iV9P7BzRsPSsfwX-N3 You may need to download software to...

Linking a pipestat in series with a frost stat , both located in the unheated garage is the usual way to achieve frost protection with minimal nuisance triggering. Obviously decent pipe insulation required as well in the unheated space.

Is it a "whole house" pump or is it currently serving one existing shower only?