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I've done it - although my walls are cross bonded, not cavity.
I used rough sawn 2x2 for the frame, with 2 inch standoffs to the wall (because damp), fleece insulation held up by battens, and vapour panel plasterboard.
I also added airbricks through the external wall for ventilating the void behind the stud.
If your walls are cavity, and you have no damp, you probably don't need the ventilation. You should probably have a vapour membrane though, because of sweaty breathing kids.
Is there plasterboard against the wall already? If there is, you could strip that, batten the wall, and attach filed & insulated plasterboard to that.
NotThamesWater
So...
Am I being crazy?
Cold rooms yeah. External wall.
What's stopping me from knocking a frame together, putting insulating material (loft stuff), putting sheet of plywood over frame. Painting.
Is that mad?