They are supposed to work on plasterboard, but hollow wall anchors are probably the safer bet.
i thnk i understand the fixing, but do i need to drill the brick for the screws, or should i get shorter screws?
As long as the screw is longer than the plug then it will work. Fischer give a min / max screw length for their plugs.
Drilling the hole long enough for the screw sounds like a good idea
@rogan started
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They are supposed to work on plasterboard, but hollow wall anchors are probably the safer bet.