The message from Prof Whitty is that vulnerable people need to stay at home. Not only to protect themselves but also the NHS + others.
The message from all the supermarket is 'come to us, it's fine, we'll even open it especially for you'
Why are the supermarkets allowed to encourage behaviour that is opposite to the official advice. I realise many will have problems with getting there food, but every effort should be taken to avoid them entering the physical shop surely.