Robbo
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2x2 is the best job, though I would be inclined to use compress anchors rather than plugs and screws as they are a great deal faster and tight as a drum.(sds 8mm and 100mm anchors) I do whole houses this way on the hollow core concrete flooring and then counter batten the opposite way with 2x1 screwed with 40mm drywalls, a couple of tips if she is plannining recessed lighting you need to cut out some of the concrete ceiling directly above where the light will be set as even 2x2 plus 2x1 plus 12.5mm board is not deep enough to house them., also with the 2x2 often there is one side a few mill different to the other so can put a bit of a wave in the board if they are not all fixed with the same thickness on the timber. Bit fussy that I know but it can be seen to a critical eye, also try and set your timbers so they fall halfway into an 2400x1200 plasterboard from both ends of the room so that there are minimal cuts and wastage when slabbing.
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