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For a loft, I'd look at getting insulation between the rafters first before insulated boards. You could then use insulated boards affixed to the underside of the raftersto counter the cold bridging from the rafters themselves if you wanted to go full belt and braces.
I'm no expert on the matter though, please do your own research and check the rules. Ventilation, Roof details (ventilation, vapour barriers) are easy to get wrong and lead to expensive damage.
Hovis
That's great work.
It's almost certainly beyond my DIY skills, particularly as our needs are different, but we have two loft rooms (I think they're original rather than conversions) but they don't have radiators or proper roof insulation, so the temperature fluctuates massively with the seasons.
Would insulated plasterboard fixed to battens be the solution to this as well, or are they only really for wall insulation?
We have relatively low headroom even in the centre of the rooms without the roof pitch, and so that seems like a better solution than proper roof insulation rolls.