Antix wrote:
Cheers Eric,
yup I think i'll remove all the plaster around the area I'm intending
to mount to try to pinpoint the centre of the bricks for a start (and
avoid any holes ending up in the mortar or 2mm from the edge of a
brick). Then re-render it to provide a more solid plaster layer behind
the plasma mount (the old plaster would probably crack under the
pressue or tightening up the bolts anyway)

what would be overdoing it ? :-) the local hardware guy said 2-3 shield
anchors (3-4" long with a 1/2inch diam shield by the looks of what he
picked up) top and bottom would be more than enough...I'm thinking more
along the lines of 40ft wall ties through the wall, through next doors
downstairs rooms and capped off with a decorative bolt on the outside
of their wall :-)

I'd also consider chasing all the way up and down the wall, and putting
in a little bit of steel fixed at the top and bottom.