Mike Armstrong wrote:

Also, I was planning to mount it to the wall primarily using gyproc
driwall adhesive (as I already have a bag) and (as suggested above)
sealing the gap at the flue with fire cement. Does this sound
acceptible?

Hi Mike

I just fixed my board to the wall with screws and wall plugs (same
fixing arrangement for the marble), just adding packing to bring the
distance off the wall up to match the inside rebate dimension of the
wooden surround. I'm sure adhesive will work well, providing you don't
intend to take it down again in one piece!

Kev