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To restate the symptoms - HW cool if CH NOT running ! If I do NOT have the heating on - I turn on a HW tap and the water does not get hot, only warm. If I then turn off the HW tap and turn heating on via the timer (1 hour CH demand) then wait a minute or two and then turn on the HW tap...

I have just started having a problem with the Hot Water supply - it now only seems to supply really hot water if I have the heating cirtcuit running first - If I turn on a HW tap without the heating on (and running for a minute or two) the water comes out only just warm. Boiler is 5 years old...