Well looking at that they must be in the valve, thank god for that, you are a diamond mate, but one thing why if they are fitted is the temp still not getting hot?
Seco?
Yes'Check nrv's aren't stuck'- whats best method of checking just blowing in them do?
May try turning acold tap on with shower running to see if it improves the heat into shower by reducing cold in.
OK mate, I really appreciate your input/help, I owe you a drink ( virtual one ) I'll do what you suggest and see what happens.Can't think at the moment.
I'll update tomorrw
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