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Ok - so the case will need to come off and the control box opened up, hopefully it's just the plastic knob that's @ issue/jammed and not an issue with the rotary switch on the PCB.

I'd also be checking the combination valve output, if you say the other taps are all fine. As @oldbuffer mentions though, I would be taking, dynamic pressure and flow reading @ the mains to give a starting point, the rest is all guess work really until there is a known baseline and therefore...

They would normally be screwed in at an angle, so get a small screwdriver or the sharp end of a screw and clear out the slots in the heads of the screws, see what type of screw they are - phillips 2 or pozi 2 - and then use a battery gun with the correct bit to get them out.

Just to clarify when you say Are you talking about the cold supply or the hot?

An unvented cylinder should really have a 22mm feed all the way from the mains to the combination valve to maximise flow. Then there should be a balanced feed either from the combination valve itself or at least after the Pressure Reducing Valve to ensure there are no issues with monobloc...

Looks like that standard foot has been covered in tile adhesive? Hammer and chisels and break it out?

Not usually if it can be then yes Cement beds are an older and trusted approach to bedding shower trays but there are much better options these day IMO. As suggested a good quality flexible tile adhesive being one excellent choice. Newer silicone adhesives are also a good option, especially...

Oh please - don't go there. We are talking specifically about push fit 32mm and 40mm waste pipe for internal domestic waste runs serving basins, baths, sinks etc. that is prevalent in the pictures I am not talking about main drainage, soil pipe or any other larger gauge pipework where ring seal...

Absolutely no bother at all - as long as the olive is fully onto the pipe, and the pipe has an insert and it's at least few mm extra then there will be no issues. As it's the olive that creates the seal and that has plenty of pipe past the olive to support it then crack on.

Yep - no self respecting pro that I know would use it, invariably it is a leak waiting to happen.

OK - that's a bit more expected. If your mains is only dropping .2 of a bar from static with 2 outlets open then your mains isn't that bad - seen a lot worse. Now it's time to check what you max flow is - ideally a check of the flow from as close to the end of the MDPE as possible. That'll...

The tube and cover that goes into the top of the trap would usually sit in a removal catch cup with a McAlpine shower trap, that cup retains the water and the tube then sits in that cup creating the seal. If that cup is missing then it won't work either. Adding in a HEPvO trap into that run...

That's not right - unless I'm going crackers too - static/standing pressure would usually always be higher and when the outlets are opened the pressure would usually drop, if anything, certainly wouldn't expect it to rise. Also dynamic flow of 9.75 L/min with a dynamic pressure @ 3 bar wouldn't...

Unihub is by Unico SYS (UCC) I believe but it's not one of the better known manufacturers TBF and it's more of a complete solution provider rather than a component manufacturer. They are better known in the US as they provide a full HVAC system with AC and ducted warm air solutions, with the hub...

Towel rails tend to the most popular rad for retaining air in the system, they tend to be @ the highest point in most heating systems, especially with an upstairs bathroom or in an attic if that's been converted and becomes the highest point.

Get rid of all the grey pipe fittings, push fit couplers are terrible things, replace the connection up to the sink trap too. As suggested replace it all with solvent weld (SW), apart from the final connection that drops into the floor, that will need to be compression and fit a proper...

Make and Model of Cylinder?

Increasing the system pipework can increase flow, it will have little or no effect on pressure. If the dynamic pressure is low <=1bar then increasing to 22mm will usually have a more noticeable effect on flow, if the dynamic pressure is higher =>2bar then increasing the pipe size will have less...

My trick with gaps like that, as long as they don't exceed like 15mm, is fill the gap with silicone and then using a card or silicone former and scrape it flat to the tile then let it set for an hour, then come back and do the external fillet. Another idea before the sealant is to blast the...

Oh dear, what a waste of time doing that mains replacement work just to jam 15mm speedfit and couplers onto it, that aren't actually designed to be used underground like that. So yep, that all needs to be replaced and as was suggested using the hockey stick pipe plus a proper MDPE coupler onto...