Police chiefs are drawing up new guidance warning forces not to overreach their lockdown enforcement powers after withering criticism of controversial tactics to stop the spread of coronavirus, the Guardian has learned.
...
It will state that while certain actions such as driving to exercise may be unwise, they are not prohibited by the emergency powers, according to sources with knowledge of detailed discussions. It is also expected to conclude the law does not restrict people to exercising outside only once a day.
https://www.theguardian.com/uk-news/2020/mar/30/uk-police-guidelines-coronavirus-lockdown-enforcement-powers-following-criticism-lord-sumption
...