Following a diagnosis of a blocked injector by a couple of your professionals, I booked a service with a local 'corgi registered' "engineer".Having taken all the front plate screws off and disconnected the piezo,pilot and thermocouple connections, he tells me that he cant take the thing apart to get to the burner/injector. having put it all back together, he suggested that I live with the problem until I can afford a new boiler and charged me £75+vat fot this great advice. Do you think this is reasonable.