What you could do is mark on the wall where the screw holes are going with a pencil, now cut the plasterboard out about 4 inches around the centre of the mark, (maybe use a cup and draw round it). Now go and buy Onecoat plaster (either from B&Q or Wickes) mix it up quite stiff and fill the holes in. Wait at least 24 hours before you re-mark the walls and drill straight in. Do not use Browning because its rubbish, Onecoat plaster sets really hard and is great for drilling into, even better than Carlite Bonding.
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