Go for the outside walls if possible and get some good rawl plugs, i wouldn't bother messing about on internal dividing stud walls if you don't really have to especially if the studs are those metal strips.
@indieross started
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Go for the outside walls if possible and get some good rawl plugs, i wouldn't bother messing about on internal dividing stud walls if you don't really have to especially if the studs are those metal strips.