I was told by my sister who works in NHS that masks really are only useful to protect those who already have infection from spreading it, unless they are proper NHS masks. Also,the wrong mask/material over face/nose can act as an absorbant for germs. Even those only work for a certain number of hours, or so I've heard.
I could be wrong and I must admit after going to the supermarket yesterday I felt I ought to be wearing a mask...and gloves. But made sure I put anti bac stuff on hands as soon as I reached the car and washed hands as soon as I got home, both before and after unpacking shopping. I find it v scary in the supermarket as despite all warnings not everyone keeps to 2 metres and I feel q stressed..ended up with a migraine. I have to go as shopping for parents too...local Co-op even worse than big supermarket as aisles small and narrow!