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Thanks @gas112 – I'd appreciate if it could be done from the inside. This is what the boiler/flue looks like inside. There's no air brick. Do you still think it could be done from the inside?

Thanks Muggles, this makes sense. Do you have a recommendation what would be an economical solution, that's better than a long ladder?

Hello, My Gas Safety Certificate failed because the flue has been installed through an air brick and has not been sealed externally. I've attached a picture. This has been the case for many years even before I owned the property, but nobody had challenged it until now. My boiler is a Vaillant...