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Do you have TRV’s on all the other radiators? If so then once they all get to temperature and close the rad in question will get more flow and should heat up more.

A hot input with a lukewarm output suggests the radiator is working.

Its an S plan system so the boiler should be heating the hot water. I wonder if the immersion has been permanently connected to mains via the switch in photo 3.

Turn down the hot radiators lockshields slightly.

the radiator should have been installed level so it doesn't matter which side the bleed valve is.

Turn down the radiators that are hottest and then see if the cold radiators start to heat up.

Today’s smart thermostats need a different way of thinking. In effect the heating is never off, you have a setback temp and a schedule for when you want the house warmer. For example if you normally want the temp to be 21c then the setback temp should be around 18c to enable the heating to reach...

This is a useful resource for converted radiator outputs based on different delta t. https://www.radiatorsdirect.co.uk/delta-t-conversion#:~:text=If

Is the system on a single pump? Does the UFH come on when the HWC calls for heat? Are you using Vaillant or 3rd party controls? How is the system connected electrically?

I have been going through this myself and I have used Heatpunk to calculate my heat loss. It is very comprehensive.

Have you seen the OT adapter below….. https://www.plugwise.com/product/nefit-opentherm-ems-converter/?lang=en

Good video here relating to a system very similar to yours.

Wiser will do most of what you want but the only devices with a screen are the room thermostats. Tado relies on the internet so if the internet is down the heating controls stop working. I use Wiser but my radiators are on a hybrid system of mainly standard TRV's and a limited number of iTRV's.

It’s not a thermostat though, it’s a temperature sensor.

I could give daily unit costs but who wants to read through 365 different daily costs. The tariff I am on changes every day, did you look at the graph that shows how the tracker tariff varies compared to the standard cap tariff? Let’s leave this part of the discussion there as you clearly aren’t...

Never mind, believe what you want.

How do you get Octo-Aid to give a figure for the previous 12 months? I can on see figures for the previous month.

How much energy have I been using? Unless you know that you can't make any comment on whether I paid too much or not. I think I will leave it there.

Electricity prices have changed with the price cap but not by a lot. The unit price i have been paying has been well below the price cap apart from one day recently. Have a look at the graph in post #158 which shows the price cap versus the tracker tariff.

I don’t understand your point or why you’re making it. My post was demonstrating that my smart meter tariff has saved me money. I don’t care what you pay, I only care what I pay. You don’t even know what my energy consumption is.