More likely a blocked injector, get it services and request they clean/check the injector and get a gasket for the gas valve handy, incase it falls apart like most do...
This is a job for a registered engineer though. Do not try it yourself.
thank you for the prompt response
is it better to call a big company like BrGas or find local Gas Certified Engineer. Are you allowed to give recommendations on whom to use?
Also how big is this problem and how long till the boiler stops working?
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