Snap. Relatives currently have only 1" loft insulation (and some areas with none). I bought some rolls when Wickes had it on offer, and was about to install when they said they are planning an extension. I've now held off, in case they are required to spend money improving the rest of the house when the extension is built. Don't want to have to spend it on something pointless just because we'd already insulated the roof. Sheer madness.