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Thanks very much - that's exactly what I needed to know. I can get going on it at the weekend. I've seen videos of that blown in stuff- it looks horrible if you every have to revisit the area to do work on it!
I had a look for government funding, but to be honest I'd rather just buy a few of rolls of wool and get on it myself - because I need the space for storage (and it's fairly small) I'd unlikely be able to meet the recommended specs on depth of insulating material which I think might disqualify me.
Insulation should be on the floor of the space. The attic should be about the same temperature as the outside. If it is warmer you will get condensation on the inside of the walls and the wood can rot or get mould.
Ensure the attic is vented as well to avoid excess humidity.
We use two types: large bundles that lie between the rafters or, in larger spaces, insulation blown in with a machine. The blown in kind is probably overkill for your mild UK climate.
The blown insulation is standard in Canada, we had minus 40C a few weeks ago.
We can get government grants to offset the cost of insulating, since it reduces energy consumption. Maybe you can get help there?