The stud partition is made up of 18mm plywood backing, and 2 layers of 15mm plasterboard. Proposing to use M8 HHD-S, but because of the thickness of partition, remove the outer plasterboard locally to fixings, so overall thickness to be 33mm.
Generally the fixings are in groups of 4 with loads of NEd = 1.42kN, VEd = 1.062kN. L...