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I would like to go down this route too. Your post is very useful stuff, thanks for sharing.
insulating underneath our ground floor floorboards
Did you already post about your experience and learnings from this? I remember a bunch of chat about rubble in floor voids, but I'm more interested in the detail of insulation and membranes/tape in relation to floor joists.
Cupcakes
ectoplasmosis
Yes, I did this as part of insulating underneath our ground floor floorboards.
It's easy and satisfying. I used Climaflex polyethylene lagging, best bang for buck. Secured with cable ties (do not fasten too tight, lagging should not be deformed at all).
You'll need to work out the outer diameter of your pipes, and use the correct bore size. We have 22mm primaries and 15mm tails to rads, so used the correct bore insulation with 25mm wall for 15mm tails, and 19mm wall for 22mm primaries.
I cut the mitres with a fully-extended craft knife. Don't worry about getting it perfect; the energy lost to a few slivers of exposed copper will be negligible.
If you have rodents using your subfloor, you'll need to wrap the lot in metal mesh tape, which costs shitloads and takes forever. We installed mesh over the airbricks to stop them getting in instead.