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Hard to say, depends on the load bearing for the shelves, number of fixings etc.
My favourites for most plasterboard applications are these but they have their quirks.
https://www.screwfix.com/p/easyfix-self-drill-plasterboard-fixings-metal-32mm-100-pack/2422h
Airhead
@meneer
Which wall plugs should I use to attach shelves to plasterboard which has 90mm rigid insulation attached to it? Would it be better to find the metal studs behind and use very long screws (not sure if this will be possible with shelves layout?)