Colin Wilson wrote:
I'm open to suggestions on this, i've got a mirror, probably about
25lbs in weight, and need to mount it above the fireplace.

This house is only about 20 years old, so i'm wary that the in-wall
chimney will be quite shallow centrally, so might be a bit of an issue
trying to mount it via a single fixing and very strong wire :-}

The mirror has two large triangular hooks / fixing points already
mounted, but i'm also wary that they won't allow any "tweaking" to get
it straight if either of the holes happen to a bit off...

What sort of fixing method would you suggest please ?

...and if I use the existing fixing points, would you suggest normal
countersunk screws and dangle the hooks over them, or what ?

I did use a central fixing with something like a 3" no.12 screw on a
picture of a similar weight in my old house which worked well, but
again, this is on a "modern" flush chimney breast so perhaps not quite
so advisable...

Pictures are ok tipped forward slightly on a wire, but big mirrors
should be flat against the wall IMO. Kind of disorientating if they're not.
I've always used 38mm unslotted glass plates. They stick out like ears
at the sides but at least you know that all the pressure is downwards.