Fixing to dry lined wall

Hello,
I need to box in some pipe work in my kitchen. A quick question really; the walls that I want to attach stud work frame to are dry lined (dot and dab plasterboard with thermalite bricks behind) so what is the best method of securing my stud work to the wall please? I am assuming normal rawl plugs won't suffice.
Thanks in advance
M

 

Thanks Astramax. I should have said I will be tiling over the boxes in area. Do you think gripfill is strong enough to hold all that weight?
Cheers