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Sorry: The make on the boiler is - Glowworm, Energysaver 40e (condensing Boiler)

Hoping someone can provide some advice I have been having problems with my boiler recently, for the last 6 weeks the boiler makes a loud buzzing noise. Originally this would do it every couple of hours. It seemed to of died down and was maybe only making a noise once a day but it did not seem...