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Surely stud finder only works if they have used studwork? could also be dot and dab to brick\block wall ,in that case long screws and standard rawl plugs into the wall?
True, and that would make life lots easier, because then you can drill pretty much where you like (as long as you avoid pipes, wire etc.), rather than having to hunt for a stud to put a woodscrew into. I was replying to @rive_gauche's suggestion that you can't find wooden studs with a detector, which you can.
Ummmmm... yes it will. Type "stud detector" or "stud finder" into google and you'll get more results than you can handle. I've used my detector to find wooden studs through plasterboard on many occasions. Most have 2 settings: one for wooden studs and one for metal, so you can even find the stud and then find the screws that are holding the plasterboard to it.