How do you support the brickwork above where you intend to install the
bracket, at the moment it is sat on a large timber across two joists in
the loft, am i going to do more harm than good, trying to install such
a bracket.
It has been stable for 20 years is that the way chimney breasts were
supported years ago ?

Im just trying to get a feel for what i need to do should the buyers
surveyor point it out as an issue.