Cash, should we have some on us?

Following on from government warnings about having enough food and water etc. It seems likely that we may need cash too. I should have got some when I was in the bank the other day but will make a point in doing so next time I'm in my local town. Do you have a stash? Like most, since Covid I rarely have it on me now, bar some £ coins. I think there's definitely an argument not to become a cash free society.

Any views on the matter and your thoughts on how much an individual should have available in readies?