Plumbers? Central heating leak sealers?

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Mum (99) has a full house care package with British Gas ( I know! ) and she has an Ideal Logic +30 combi boiler. Over several months, the boiler has lost pressure every two weeks. BG have been back several times, looking for leaks, changing radiator valves, checking the boiler and can find nothing leaking. Today ( after a one week pressure loss), they have added a central heating leak sealer, which I presume is the plumbers version of Radseal (as used on cars!). Any thoughts on this, or are we fighting a lost cause?

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