I'm low risk of serious consequences and have been WFH and staying at home with groceries delivered weekly since sent home from work on 12th March long before the lockdown. They are prioritising the health and safety of staff and customers, it would be odd of me to do anything to increase risks.
I wear a face mask if I do have to go into an enclosed space, such as the local chemist or post office.
Walk most days on footpaths across fields.
I avoid contact with others not because I have any fear of contracting the virus, but because, if I caught it, as an asymptomatic spreader, I could be spreading it and actually become the cause of many people suffering, even possibly dying.
Yesterday, when I was out for a walk I stepped off the path a good way to allow someone coming in the opposite direction go by. I was wearing a mask , the elderly lady was not. She stopped to reassure me that she had been shielding for twelve weeks, this was her first time out so I should not be afraid of catching anything from her.
She appeared genuinely shocked when I said that my precautions were to avoid infecting her rather than fear of catching it.
The solution for me, as PPs have suggested, is to get test, track and trace going. I have no idea why it has taken so long for us and is still not fully in place. I'm not usually a conspiracy theorist but I do wonder why our government was so keen to fund the development of a new system rather than adopt the existing one already in place on the continent.
Once we know by extensive testing where the virus is, avoiding it will become so.much.less arduous.