In article , JohnB wrote:
I have purchased a wall mount for the screen, and some
conduit to house the cables

and a stone cutter attachement for a drill.

Don't even think about it on an occupied house - the dust will go
everywhere and still be reappearing in a year.

What I've done to get neat chases is to drill two vertical rows of
holes about 25mm deep either side of the chase which act like
perforations: you can then knock out the chase very easily (by hand or
SDS chisel) without shaking up the wall to much or loosening great
areas of plaster.

--
Tony Bryer SDA UK 'Software to build on' http://www.sda.co.uk
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