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I spoke to a building control surveyor at my local council and I was a little surprised by what he said after reading the responses here. He said he would use the foil rather than filling the rafters with PIR, so long as the gap between the foil and the inner surface was sufficiently airtight...

TLX claim you can achieve a U-value of 0.2 with Rafterfit and 60mm PIR. The price difference between that and all PIR isn't much plus the foil is easier and quicker to install, though if we could use the cheaper foils it would be a relatively big saving. Ignoring the fairly small insulation...

Sorry if this has been done to death but I did a search and couldn't find quite what I wanted. I've recently been looking into insulation for my sister who's doing out her attic room. The house is a terrace built c. 1900 and aside from a window it's all original, just lath and plaster...