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Thank you both so much for your input. In best response to all your questions, Richard, here's some pics of the layout which should answer most of them. What do you think? Cheers

It's a big tank...the plumber suggested - and fitted - a one way valve to the vent (where he thought air might be getting pulled in) but it got worse and has now on two occasions disrupted supply to the hot water taps in the bathroom, so the air is getting into the main system.

I've got a new power shower that worked fine for the first month but then would start to lose power after a couple of minutes. After turning it off, there'd but a bubbling in the pipes and eventually I could start it up again. It's gradually getting worse. All the connections seem to be good...