Sorry me again, to provide a bit more info it i’ve checked the main tqx0027 programmer is set to auto (previously was set to on for everything), to see if it made much difference, but doesn’t seem to have.
Having checked the boiler, it seems to be firing up even though programmer is off...
I’ve just moved into a new place and never had a hot water cylinder before so this is new to me. However, i’m finding that it seems to be turning on constantly and throughout the night, the airing cupboard it is in is very warm. There’s also a minor leak but that’s by the by, unless it might be...