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It's not "sweating" - unless there's a leak somewhere. Normally it's just water vapour in the air condensing out on the cold walls of the copper pipe - kept cold by the fresh water feed coming in as you draw off cold water for household needs. Always worse in the winter when the mains cold...

WD40 is not actually very good at freeing off rusted items as all it is a water displacement material. You want to use something actually labelled as a penetrating oil.

Siphons don't usually "bust". The flexible diaphragm inside them just starts to disintegrate and won't move enough water up into the siphon to start it flowing. They can normally be fixed just by replacing the diaphragm, which is often just a sheet of polythene.

It's amazing (and shameful) how so-called "experts" can miss such a simple issue

And still people are installing these boiling water taps! If the Quooker really does keep its water reserve near boiling continuously, then apart from the waste of energy doing so, it won't be much good for making tea - which requires freshly boiled water without all the dissolved oxygen...

The only issue I can foresee with solvent welding the gutter sections is how the long gutter will deal with the considerable expansion that uPVC experiences when subject to heat from sunlight. The joint systems for uPVC gutters are sealed with rubber seals which allow for expansion and...

I think BG fitters are trained to say that ALL parts on ANY boiler they are called to repair are "obsolete" That way, their fix is always "a new boiler" - can't get the parts for these old'uns (even when only a few years old!)

Judging by what can be seen of the old radiator's condition, it would probably be better just to replace it, rather then spending time trying to get the stuck tail out.

Despite the (good) advice to avoid flexi pipes because of their tendency to accumulate muck and block, it does seem that in the case of a bath like this, which can only be stuck down, it's the way to go. Inevitably people will sit on the edge of the bath and it will move a bit, so any rigid...

When you do get the waste pipe repaired, you'll also need to find a way of supporting the bath more effectively. It should not have moved sufficiently to break the waste pipe when somebody just sat on it!

Yes, indeed you can, but you'll still need to connect the compression tee to the filling loop valve, which will require a short length of copper tube. The compression tee connection to the existing copper tube MAY be able to use the existing olive and nut, but it would probably be wise to remove...

But the OP said in an earlier post that he was able to turn the pump rotor freely in both directions.

Before you try just tightening the end cap you need to see where the leak is coming from. If it's from the end cap then tightening might work. If it's from the holes, tightening the end cap won't make any difference and indicates, as you suggest, that the safety valve is leaking slightly due to...

Well of course it will if the loft is well ventilated - since it is continually exchanging loft air with outside air. That just shows your loft is properly ventilated - nothing to worry about, and it's very unlikely that they'll be any condensation forming because the air and the roof components...

Why what?

Yes, it does look to be a faulty radiator and, if that's the case, Barratt should replace it under the 10 yr warranty. The pictures also show stains from a leak around the bleed valve. This can easily be fixed by screwing it in a bit more or, failing that, removing it, fitting a new O-ring and...

Interesting - the OP asked us all for our advice, but has spent most of the time rejecting it!

I assume when you say this you actually mean the return to the boiler stabilises at 5C BELOW the flow temperature? A return temp of 5C would be VERY low indeed!

Yes, roller blinds in suitable materials that allow wiping clean are best for kitchens and bathrooms. Curtains would be a real fire risk in kitchens, and would soon go mouldy from water splashes in bathrooms.

If the gas is turned off outside the house then, if the boiler relies on a pilot light to restart, this will be extinguished and the boiler will not restart when the neighbour turns the supply back on. If instead the boiler has some sort of piezo electric relighting system, then someone has to...