benpost wrote:
i have a long (metre or so) gap in the wall about 1.5 inch deep and 1
inch high where i think cables used to be. how would i fill this ? it
seems to big a gap to use standard filler.

ive seen this in the shop would it do the job ?
http://www.polycell.co.uk/products/p...polyfilla.html

cheeers
bonding plaster to 3 mm below finish level., then normal filler or skim
plaster.