Mine vapour barrier than more celotex then plasterboard.
I'm 20mm monocouche render, 4" dense concrete blocks, 4" cavity, tyvek, 12.5mm osb on 4x2 studwork with 100mm celotex in the wall, another layer of 12.5mm osb then vapour barrier, then 25mm celotex then 12.5mm plasterboard then skimmed.