Boiler thermostat is the most likely culprit but you need a gas registered installer to fit it and carry out the relevant safety checks.
It's a regular fault.
Thanks for your thoughts Jeff, it was something my plumber was considering but I can't get him to nail down a day to check it, I'm thinking that he cant really identify the problem so would rather distance himself from it rather than change something that wasn't the problem,
That's for sure, but the the motorised valve needs replacing for sure, so I'm going to do that plus drain and de sludge as much as possible so it sounds like the only other thing to try after that is boiler thermostat replacement, failing that burst into tears
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