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How to Choose Gas Fitters in Milton Keynes Gas is dangerous. Only Gas Safe registered engineers are allowed to work with your boiler or other appliances. You can check an engineer's credentials by checking their Gas Safe ID card. Milton Keynes heating fitter was jailed after he performed substandard work on the boiler of a customer. The installation was not safe and could have released harmful carbon monoxide. Qualifications When choosing a gas fitter it is cruci