I have just removed some frog tape from a painted wall and it has taken the paint off down to the plasterboard (4 layers, 2 undercoat and 2 topcoat).
How should I go about repairing the damaged areas?
I am assuming you have quite a divot that needs some filling. I recommend using lightweight Spackle. It is very easy to apply, and you can smooth it with fine sandpaper and a damp sponge about 15 mins after you apply it and paint it within an hour.