Sorry, I meant how do you know the bit about draining the overflow pipe
(since you can't see into it)?
Basically hearing it.by standing beside the cold water storage
Though with mains behind it you'd expect some force, even if the actual
flow wasn't up to much.
I will try your suggestion of trying to cut this pipe near the joint at the
top of the cylinder and pushing a wire in to clear any possible blockage.
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