If you seek the C-word on the label of your fizz above all, plus, preferably, a reasonably well-known name, then it's off to Somerfield for you to take advantage of their half-price offer on Heidsieck Dry Monopole, reduced from £17.99 to £8.99 until 18 February. Poor old HDM, however, is hardly the loveliest champagne around.
And do let me know if, like a previous correspondent with their Veuve Clicquot offer, you encounter rationing.