If you have been instructed to stay at home by the government, you can buy a Co-op Community Shopping Card by calling 0800 029 4592. The card will be posted to you within 2-3 days. You can top-up the money on it by ringing the same number.
Your friends or family can then use it to do your shopping. Or the Co-op can put you in touch with volunteers in your area who will do so.