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Is the tray on a riser kit?

Is there a size on the cap? A 1 1/2" female compression adapter may fit?

Exactly right , mains dynamic pressure and flow is key. As mentioned, you can only get out what goes in.

No and you're right, if the Quooker is on it's own feed off that pipe and the isolator is on that feed pipe, then just turning that off shouldn't effect the other outlets but it's the only thing that's changed so that would be the starting point for fault finding

If the flow was fine before and then it suddenly dropped after some work was performed then that usually points towards something having changed when the work was done.

Sorted - Only thing I would add is the drain hose should be up and over the top of the cabinet and down into the spigot rather than coming up from below. That minimises the chance of water from the sink entering the hose and running down into the appliance or if the waste pipe blocks and it...

Even though they're a local trade unfortunately there's really no way they can know if the supply is adequate or not without testing, that's not a good starting point. Get the transporter out to check the mains flow and pressure at the toby, that'll provide the correct starting point and...

To clarify, the downstairs stat isn't calling for heat but the upstairs stat is, so the boiler is on? When that's the case and the downstairs stat isn't calling for heat and the valve's light is off the downstairs rads will still heat up? If so, when you turn off both of the stats and the...

It shouldn't, 3 bar is more than enough to blast the hair off of anyone's head as long as the pressure is maintained when run. I.E. it has a well sustained dynamic pressure.

As long as the flexi's are WRAS approved then they shouldn't have an issue with normal hot (~55 degC) or cold water, same with the pressure as they would usually be rated to at least 6 bar. FYI a 5 bar dynamic mains pressure would usually be reduced to 3 bar just to minimise the stress on...

What are you trying to do? Is this just to put 3/8" tap flexi's onto 15mm hot and cold feeds? If so the brass 3/8" adapters you have linked to fit into a standard 15mm ISO compression valve, nothing else needed.

Dimensions for the 1200x900mm tray And the trap/waste dimensions

78mm height for the Marley appliance adapter, the McAlpine is similar @78.5mm so should fit ok.

Kudos do a tray called the connect 2 that allows for multiple connect configurations. Not sure if that might work? https://bathroomshopuk.co.uk/product/kudos-connect-2-slip-square-rectangular-resistant-shower-tray/

If they look like this then no they haven't changed. HEP are known to be stubborn sometimes though when trying to demount and can take the insert with them making them unusable.

+1 - that underground coupler wont sit/seal on the cast properly, you need a tight joint, Fernco/flexiseal is the one for that. Clean the cast up too before connecting.

Unfortunately it's not one for the forum, we have no idea what the current pipe sizing is, how much of the current pipe is 22mm and how much is 15mm. Really hard too for the installers to know if the pipe is all encased in concrete. All that could be done is a pressure test with the current...

No, a trap wouldn't affect whether the pipe would back up or not, either the pipe's restricted, the drain hose isn't far enough in or there's too much water volume. Of course, standards dictate that it should have a trap, if nothing else to stop sewer gases from escaping.

You now want to waterproof the whole section, how that's done is up to you. Yes, the Mapei kit could probably do it but it all depnds on the surface finish once you cut that floor and board back. The Mapei kit is a polymer membrane that's painted on and comes with a primer and tape but you need...

That tray isn't sealed properly between the tray and tile on the outside, at the blue arrow, hope that isn't indicative of the tray to tile seal inside the shower. The silicone should run all the way behind the tray against the wall and all the way to the end of the tile/tray edge and then down...