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Does anyone know what the regulations are concerning these issues as I
would like to know where I stand before I confront him.


Building regs approved document J - link below.

http://www.odpm.gov.uk/stellent/grou...eg_027748.hcsp

From my understanding a boiler flue must be at least 600mm away from a
facing boundary. Therefore if his wall (through which the flue projects)
forms the boundary then this arrangement is not acceptable - speak to
Building Control Officer at the local council.

A.