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to add to my earlier post, i found this to be an excellent resource
http://www.sofiepelsmakers.com/suspended-timber-ground-floors.html
gillies
Under-floorboard insulation - have i got the right idea?
bottom layer (closest to bare earth): breathable membrane (something like Tyvek?)
middle layer: the main insulation (not necessarily important whether rigid kingspan or soft rockwool type stuff)
top layer: airtight/non-breathable membrane (not sure what - could plastic sheeting suffice if gaps left by airbricks?)
essentially, I'm hoping to try to re-create this process but on the cheap if possible.