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I wouldn’t go as far as a half turn, I did mine on an 1/8th turn first and then turned each lockshield another 1/8th turn until all rads got hot.

I think people buy mechanical TRV's because they don't need an app, dont need batteries, rarely go wrong and are generally cheaper for a good quality TRV rather than pay cheap for a poor quality electronic TRV. I dont see the point of a "smart" TRV that cant control the heat source, you may as...

As a landlord then surely your boss is not legally allowed to deduct anything directly from your salary unless it pertains to your employment. You are right to gather all the information and evidence regarding the poor maintenance which is the landlords responsibility, I would also give him a...

5.5kW for one room is crazy, my whole 4 bed house is only a bit more than that! You could go with the DT40 radiators and run a suitable flow temp as required. Then fix the building insulation issues, especially the loft insulation as it’s a quick and cheap fix, then gradually lower the flow temp.

What is the heat loss of your property? I can't believe it is 22kW more likely to be around 8-10kW. A combi boiler in a 5 bedroom house with 4 bathrooms is less than ideal. As @gas112 has said swapping 15mm copper for 15mm hep is going to add some restriction to the flow.

Size the radiators for a DT30 rather than DT50

Did you open the lockshield valves fully? If so turn all the upstairs radiator lockshields to be open a 1/4 turn from closed.

Shelly have a number of sensors that can be used with their switches. Off the top of my head they have motion, temperature, humidity, door/window and light sensors that can all be integrated with Alexa.

Have a watch of this, it explains it all very clearly

The average UK home needs 6-8kW so yes the vast majority of system and heatonly boilers in the UK are massively oversized.

That looks like an old Hive controller.

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.