I'll mention to the engineer about the boiler 'coming off the wall' and see what his opinion is. I find it hard to believe that its a real issue especially as its been on the wall for at least 12 years.
Because these engineers work in customers homes and not under direct supervision many of them make up most amazing statements when talking to customers.
Few customers make any complaint and so they continue to make them.
In this case its been suggested that the design of mounting bracket allows a little movement of the boiler even when the bracket is firmly and correctly fixed to the wall.
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