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All I can say to that is the vent from the boiler to the header tank must not have any restriction as it is necessary for expansion when the boiler is firing. If it is the vent for those circuits as well then they should vent naturally without any intervention, but impossible to be sure...

Obvious question perhaps - did the old one work before you removed it?

Yes you may just have air trapped in the hot water circuit. There will be a) an auto vent, b) a manual vent or c) the pipework will have been installed such that it can vent naturally. If a) then the vent might be stuck and therefore not operating correctly. Otherwise you will need to...

I can only comment based on my own experiences but let me give you a comparison with my own system. I have an open vent system with a conventional (10 yrs old) boiler. I did suffer from pumping over but found a blockage where I described (common problem), cleared the blockage, flushed the...

I assume you are saying it is manual - so possibly a gate valve? If so, it cannot be a bypass if it is fitted inline with the cylinder coil as you describe. For it to be a bypass it would have to tee off to an alternate circuit. What you have described (I think) is a simple manual flow...

Seen plenty with an upstand and tiles. Beauty is in the eye of the beholder :)

Without seeing the evidence it's impossible to say. But as your guttering did fall down the likely as not the fascia boards were completely rotten so full replacement would have been the only solution. Pictures from outside of the area where the water is coming into the bedroom would be helpful.

The gate valve is there to allow you to reduce the flow through the cylinder coil so that the hot water circuit doesn't rob all the heat when you are running the central heating at the same time. Forget the gate valve for the moment. You need to concentrate on getting the heating to run...

Banging noises usually indicate air in the system. Not likely to be rad connections as these would show leaking water first. The pumping over (water from vent entering the header tank) would suggest a blocked cold feed or possible incorrect pipe configuration. Check with a magnet where the...

If I understand you correctly the problem is at the junction of the outlet hose and the waste connection. Therefore there must be a blockage at that point, since the machine seems able to discharge water as far as there. I would remove the union from the waste and check for obstruction or...

The principle is to brush the sand over and whack it down so the vibration helps the sand to fall between the blocks. Brushing the sand over a damp or wet surface will result in the sand becoming clogged and not filling the gaps.

Personally I would leave it until the spring. Walking over it again, even with an aerator will just compress the mud even more and you won't achieve anything.

You could do as you suggest and cut a piece in. Or you could just claim off your insurance and get it all done (unless you excess is huge).

Use oil-based gloss. My mum's been doing it for years!

Probably a yank or an aussie! Seriously, just buy an ordinary shredder. Much less risky.

Don't spray foam it whatever you do. You just need to ensure there is sufficient air flow through the loft to ventilate it. Is there space around the eaves such that air can flow in from outside and circulate through the loft?

Factors like resistance in the pipework would have some effect and would depend on the proximity of the boiler to the cylinder. Some installations incorporate some kind of flow restrictor in the hot water circuit to balance the flow rates and any bypass circuits could have some impact. All...

I don't have the answer to your specific question but do watch out for data roaming. Many phone apps will run in the background and could be using data even though you are not actively connecting. Results can be very high data charges so look carefully at that. Best to run off data roaming if...

This sounds like a recipe for a quick visit to A&E to me. Welding a circular saw blade to anything for use in a drill without any means of protection/guard is a massacre waiting to happen. Especially as you are new to welding and can't guarantee the quality of a weld that could let go at any...

Assuming you are talking about emulsion on the wall I would just have a damp rag to hand and wipe off as you go.