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Your gas usage for Sept 2024 looks extremely low. I live in a similar size house to you and my gas usage is around 500kWh in September. How are you measuring gas usage and how are you dividing the usage between heating and hot water?

These are the best fixings https://www.screwfix.com/p/corefix-connect-metal-plastic-100-heavy-duty-dot-dab-wall-fixings-10mm-x-95mm-24-pack/344hg

The hive is wireless so he needs to link the old thermostat wires.

Disconnect the room stat cable in the wiring centre and add a link between the terminals that the red and yellow were connected.

Shelly can do that with a schedule. I use the devices to control a couple of electric panel heaters.

I guess “smart” heating means different things to different folk. :)

Isn’t that what the OP asked for? It was stated that they wanted you use their phone to turn it on or off.

That’s not “smart” heating, it’s just remote control of a switch.

Have a look at the Shelly 1PM or the Shelly 1PM Mini, both operate over WiFi to a phone app and can be hidden inside a backbox.

So you have a Tado "smart" heating system, are all the TRV's Tado as well? If they are then any Tado TRV should be able to turn on the boiler but if the 2 TRV's upsatairs are normal TRV's then they wont turn the boiler on.

What make of smart TRV are they?

Another thought…… don’t install an S plan, have a PDHW system with a diverter valve.

As said above a 30kw system boiler is way over sized for the majority of homes. What is the heat loss of the property, that is what determines the size of boiler. As also already said if you go with Vaillant or Worcester then use their controls. You can use standard TRV’s or so called smart...

I suspect someone has used the CPC as a switched live that was connected to the NO connection but check where the CPC goes to before reconnecting it. If my suspicion is correct you could get the boiler to fire by adding a link between COM and NO so at least you will have heating but without...

It’s likely to be either the gauge, the PRV or maybe both that is faulty but a competent gas safe engineer will easily fix it.

Is there a reason why when your dad replaced the 15mm plastic with copper that he didn’t just use 22mm copper which presumably would have fixed the issue?

The Wiser system, gen2 version, can also use other Wiser “smart” devices to detect presence and door/window opening, which could be used to switch the heating on or off. The gen2 hub is more of a “smart” hub rather than just a heating hub like the first gen.

These types of tap are a pain in the a***, IME they always leak after just a few months of use. You will need to order the specific cartridge for the tap and whilst your at it order both for hot and cold.

Oops, updated original post

Yes, the boiler will short cycle which is not ideal for efficiency.