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 ?

Use the hooks, just be careful to get the holes level. You can always add a
'sleeve' of plastic tube or even tape over one screw if necessary. Use pan
head screws & a washer of you are worried the hook might slip off the screw.


--
Dave - The Medway Handyman
www.medwayhandyman.co.uk