To freeze peel the covering leaves off and clean the cob of all those little silky bits. Cut the top 3cm (an inch or so) from the top end of the cob and drop into already boiling water - boil for 4 minutes. Drain away the hot water and run under cold water for 4 minutes. Dry them with absorbent kitchen paper and wrap each individual cob in cling-film. Place them in a labelled and dated freezer bag and put it in the freezer. Some people put them in the freezer without blanching.