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The o ring should fit around the part that the cap screws onto.

Yes, anticlockwise turn then lift out. There are video links on the Siamp website showing how.

Fill valve looks like Flomasta from Screwfix but seems to be working correctly. Flush valve is Siamp Optima 49. Easy twist and lift out to check seal. Sometimes just needs the limescale scraping off the seal and the seat. A new seal will be less than a fiver online. New valve is about £20 from...

Easy for you to say

The shower would have been fitted and then tiled over. Even if you had an exact match you wouldn't be able to fit it without removing tiles.

Yes. Turn off water. Lift the locking ring on the stem of the valve. Pull the valve upwards. Replace with new part. There is a little spring clip which can slide up the metal rod to adjust the height of the float. On later ones it was replaced by a plastic screw adjuster.

Never bother changing washers on these. A new valve is only a few quid and you only need to replace the top part with no need to drain the cistern. 10 minutes including cuppa.

Do you mean drain the cold water in the house via the heating pipework by way of the filling loop? In a word, NO. You can drain most of the water from the mains pipework by shutting off the stopcock and then opening the lowest outlet, followed by opening the highest outlet. The lowest outlet is...

Yes it should really be there. To be honest, though, after a few years, drain offs are so unreliable that I would be looking for any other way possible to drain pipework rather than use a drain off that will either not work at all or will leak after its been used. However, if its on their quote...

I've never seen one like that. May be worth sending these guys your photos to see if they have any ideas. https://toiletseatstore.co.uk/

Boiler manufacturers usually specify a minimum distance of copper pipe attached to the boiler but beyond that point barrier pipe and plastic fittings are ok.

With an external soil stack and sink waste going out through the wall into a gulley, I'd be very surprised if there was an issue under the kitchen floor.

Temporary repair to the soil stack with duct tape until it can be repaired or replaced should rule it in or out as the problem. My money would be on the trap being pulled though. Reducing from 40mm to 32mm is very likely to cause suction on the water in the trap. You could try an anti vac trap...

It may be the angle and perspective but the waste pipe looks narrow. It should be 40mm but if its 32mm and there was only a shallow trap its possible that the trap was being pulled by self siphonage when the sink empties.

Ah, I assumed it was an upstairs flat. The vent pipe needs to be higher but it wouldn't cause a smell downstairs.

The soil/vent pipe termination is too close to the windows. I can't see whether the vent pipe is open or has a durgo on the top. I suspect that smell is coming in the window. Other possibilities are that the sink overflow is sludged up and smelly or that the trap is getting pulled when the sink...

The PRD is on the back of the outlet. Remove the two screws on the left hand side of the white outlet pipe. This should allow you to remove or at least rotate the outlet to get to the PRD. I assume you've got the power off by this stage.

The Siamp fill valve probably needs a new washer. https://www.screwfix.com/p/arctic-hayes-siamp-diaphragm-washer-29mm/5006j You will need to turn the water off to do this. The washer is located under the knurled ring at the front of the valve. Pay special attention to the position of the short...

On closer inspection of your 1st photo, there appears to be a significant crack in the cistern running down from the back left hand corner. I would check this out and watch out for it leaking. It may be though that due to the back to wall design, you may not notice a leak.

Its a Siamp Optima 49 flush valve. It's a twist and lift out replacement. TBH, I wouldn't bother turning the water off to do the job as it will just run away into the pan while the valve is out. Those back to wall pans are a pet hate of mine. There is no way to monitor condition of connectors or...