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That's a relief - i was anticipating a huge bill (It's been one of those years!). Thank you (and for such a quick response).

I have a three year old Sime Format C boiler. For the last 4 months it has been a bit awkward in providing hot water for the shower. It might do, it might not! It only seems to affect the shower and most frequently happens if you\\\'ve flushed the toilet within about 10mins before turning on...