sp1814, this is from the BBC an hour ago (and note where it says guidance)
Government guidance urges people to "stay local", use open spaces near their home and avoid unnecessary travel
Guidance to police says that the public shouldn't be sanctioned for "travelling a reasonable distance to exercise" - although no definition has been given
People should only exercise once a day, although in England, Scotland and Northern Ireland there is no legal ban on exercising more than that. In Wales, which sets its own health regulations, exercising more than once a day is now illegal - and potentially a criminal offence
You can exercise alone or with members of your own household
Gatherings of more than two in parks and public spaces have been banned (ruling out most team sports)
Dogs can be walked as part of a person's daily exercise
It's not specific about driving, or how far you can go, and there's no mention of beauty spots. I assume the police are allowed to make their own rules
eg no Pokemon!
https://www.oxfordmail.co.uk/news/18344513.coronavirus-lockdown-police-stop-bicester-dad-playing-pokemon-go/