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"You can sit in the sun in your local park, you can drive to other destinations, you can even play sports but only with members of your own household."
https://www.gov.uk/government/speeches/pm-address-to-the-nation-on-coronavirus-10-may-2020
Edit.
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Indeed, in addition to:-
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Two people from different households will be allowed to meet outdoors if they stay more than two metres apart, the BBC understands, while it is also thought sports like golf, tennis, fishing and outdoor watersports will be allowed for people in the same household.
"https://www.bbc.co.uk/news/uk-51506729 (sources are useful for quotes)
You can now go out for exercise as long as you want and meet with one other from another household, so its a slight shift