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Thanks both. The leak seemed too big to be fixable with Fernox. It would have been worth a go before we let it get so bad. For some reason, the immersion was not wired up. Perhaps just a lazy installer? One trip to B&Q later and the interim looks set to be some cheap convection heaters and...

My Glowworm Ultimate 120FF boiler of around 10-14 years old has been leaking from the heat exchanger and its recently got a lot worse. A local engineer has told me that the heat exchanger has to be replaced and Glowworm also say the same thing. You can clearly see it leaking between the 2 halves...