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I said heat ex straight off mate. But I get the impression he doesn’t want Any part in it? As he says there is a load wrong with it.Just skim read this so may have missed something
The pressure rise will probably be a pinholed main heat ex (between mains cold and heating side) and the banging could be the prv chattering due to overpressure
Have changed a couple of older Worcester twin pipe heat exs and they aren't cheap
edit
by twin pipe, I mean separate waterways for heating and hot water (it;s actually 4 pipes) doh
You sure about that one Shaun C...??Just a good old decent service and replacement of the ex vessel and you will be good to go and you will be fine
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