agree with freddy as the insulated plasterboard route tends to be a much more expensive way of doing things try these guys they might help ive used them on last couple of jobs beat the local merchant prices by quite a bit, www.bmdinsulation.com you migh also think about using a multifoil like...
hi george
ive used howdens on last 2 renovations and they are very good quality, so good put one in my own house after being impressed with them, price is good but found you do need to haggle a bit as there seems to be quite large discounts available. :wink: