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The black sludge is iron oxide, known as magnetite, which is a result of the water in the system oxidising and breaking down the inside of rads, its then magnetised as it passes through the AC field in the pump and sticks together. Inhibitor only slows this process and does not stop it. A...

As it's a Combi you will need to comply, which boiler have you been quoted for?

Its more than likely one of the motorised valves internal switches

You need to use an unvented qualified plumber to work on that cylinder

Take the easiest pipe route, whichever that is, making sure you have access to the fittings. The bath and sink can be combined internally, you don't necessarily need to go up to 50mm, as it's unlikey the bath and basin would be drained together, swept 40mm tee with 32mm reducer from basin

Replace diaphragm washer, it's probably stretched

Yeah, that's a boss fitting

Definitely go with Vaillant, depending on gas pipe run, you could get a EcoTEC Plus 412 12kW, which should be suitable for the size of your property. An additional energy saving device is required under boiler plus for Combi, for regular boiler it must have a timeclock and room thermostat to comply.

Flux has a cleaner in which is activated by heat, so oxidised pipe is fine, as long as it's not old or dirty. Most plumbers will use a pipeslice which leaves minimal burrs anyway

Your system is unvented, which is why you don't have a tank, often when the valve let's by, it wont reseat. You need to get an unvented qualified engineer to work on this system. The red handle valve is a pressure relief valve PRV which is a safety device. The whole caleffi block doesn't need...

09804 10163

Auto Air Valves are for filling/commissioning only and once the air is out the system the black cap is shut to prevent leaks

Automatic Air Valve and black cap should be shut.

Yes, you will need to replace the programmer with a heat link.

Blocked flue?

Photo of tado wiring would help...

Yes, that's correct.

Sorry response was vague, Brown to live Blue to neutral Black to 4 Link wire from live to 3 common

Live should go to terminal 3 not 4...

If you have a multimeter it's worth checking the voltage on the Orange wire from the 3port actuator, when the thermostat is satisfied there will be no voltage on the Orange, Keep multimeter on and see if you get 240v when the pump starts again.