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All good tips - thanks. I was planning on gluing and using a bead of adhesive too. I made the Mrs lug 5 litres home in the baby buggy this morning.
And you're very correct about the floor height - there'll be another 20+ mm of insulation, heat mat, and then laminate.
(Except in the shed, which I'll have something a little more industrial)
NotThamesWater
You are overthinking things.
You would not notice any difference in height, I doubt that this will be finished floor level (happy to be wrong on this) so you still have underlay and flooring to go on top smoothing things out more. If you really must do something for your own piece of mind a good bead of construction adhesive (gripfill, sticks like sh*t, CT1 etc) on the top of the joists before laying the boards this will hold the floor tight (many structural flooring systems require it) and take out a lot of the discrepancy.
The chipboard sitting on joist hangers will not affect squeaking. If you don't want the floor to squeak you need a good amount of PVA applied to both the tongue and groove at each joint squeaky chipboard floors almost always mean someone has cut this particular corner.