Ah, ok, found the insulation: but also found that he doesn't like OMF as he considers that the wind sweeps in...simple solution being to put a spare super under the floor for winter (which I'm pretty sure I got off a Scottish leaflet at some point). I'm grateful for every mite that falls out the bottom of my OMFs . Meanwhile as warm air rises it seeps out from the gap at the top with matchsticks reducing the good done by the insulation.
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