The general advice is that "local area" refers to roughly 5 miles but that isn't going to be rigidly policed. I'm walking distance to my course so not an issue for me but will be interesting to see the extent to which that is applied.
I'm certainly going to visit my mum as soon as we're allowed to meet another household in their garden and that's 60 miles or so.
That would be interesting. Lots of loopholes in that method I think.
My other half is an obsessive outdoor swimmer and has been missing that during the lockdown. Her nearest swim spot is 5.8 miles away and she's (rightly I think) decided that will be OK. The next is 6.4 miles, she's not sure about that one. And another favourite is about 13 miles which she's decided she still won't do.