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@rhowe
It there's any crap taking space under the floor, take the opportunity to remove it to improve airflow. I filled many rubble sacks when I did ours.
Also run any cables or at least trunking you think you may need in future. Once that sucker is sealed you won't want to lift it again.
Is it bare earth underneath or concrete? I'm guessing bare earth. You want to make sure all your air bricks are clear because by putting down a membrane and insulating you're reducing the ventilation to your subfloor.