On sheet of 50mm Jablite costs about £11 in B&Q and will make you 10 18" squares of insulation. If nothing else, keeping the top insulated stops water droplets condensing there and falling on the cluster. I am going to leave the insulation in place until it is time to put the supers on.
I've been meaning to get organised with polystyrene for a few years, yet there always seems to be something else needing done (such as checking emails, looking at fora ... !) so I haven't. I still should, but this winter has shown me that healthy colonies don't seem to mind less-insulated conditions. The only thing over the ply crown boards were empty Apiguard foil trays covering the feed holes.
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