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This is Saarf too. I'm thinking to just go for it. Gas supply was replaced yesterday (whole street is being done). Boiler worked fine afterwards, packed in this morning. As they say replacing the gas supply shouldn't affect it and the tech I paid to come out couldn't prove either way, I'm on my own. Could replace two parts but the make is no longer supported (Heat Line) even though it's 5 years old and that wouldn't guarantee a fix. Would also take at least a week to get the parts.
I paid 2k + VAT recently in south london. Which was good.