As this is a group frequented by those who are interested in DIY, I hope people don't mind me posting my insulated plasterboard here:
19 sheets of 80 mm PIR on 12.5 mm plasterboard to standard size of 1.2 m by 2.4 m.
Location is Northampton, more detail can be found on Gumtree using the ad ID 1364183439 and there are pictures there.
S.