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Cheers, will get in touch with one of them.

Thanks, that sounds like a good idea. I'm in North London (Barnet).

Thanks. Sounds like I need to involve a professional... I suspected that the boiler was too large. We don't have that much underfloor heating (house area is c. 400sqm in total, underfloor heating will be less than that). For some reason we also have a huge cylinder (500 litres) and I presume...

In an effort to control my extremely high gas consumption, I turned down the "flow setpoint" temperature on my Keston Heat 55 boiler from 70 degrees to 48 degrees. This has substantially reduced my gas usage. I have underfloor heating and this new temperature seems to be high enough for that...

Thanks very much, will do.

Cheers. Does that mean it needs to be replaced?

I had been hearing a loud clicking noise from a motorised central heating valve, as per the following clip: I've now moved the lever on the valve to the position shown in the attached photo (the opposite of where it was) and the clicking has stopped. I can see that the lever's current position...