Not much to do but do inspect the tubers removing any diseased or  broken parts.  Dust with flowers of sulphur and cover the roots, not the  stems, with dry soil or sand or peat or ashes.  Pot roots can now be  cleaned and cut back.
Prepare the greenhouse in readiness for  laying the tubers down to begin propagation.  As a commercial grower I  start off in mid-January and advise anyone growing the 'giants' to do  the same, they just seem to take longer to develop to mature plants for  planting out
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