It's just under 1. Borderline between the red zone and green... perhaps more into the red, from memory (I'm at work at the moment so cant check)
Worth topping it up a little, do you think?
Thanks. From reading up online today the heat exchanger does seem to be a likely suspect.
I'm not back at the house for a few days as I work away during the week so I've just been trying to get a bit of a heads up as to what the problem could be, and will get a gas-safe plumber around to take a look as soon as I can..
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