5 miles as chosen by some other of the devolved parliaments seems a little on the small size. Several of my neighbours have family reasonably locally but more than 5 miles but less than 30.
https://www.gov.scot/coronavirus-covid-19Update 28th May. Phase 1 of the route map for moving out of lockdown.
Heading: "Travel for exercise, recreation and to meet family and friends"
"... our advice is that you should stay within your local area when you go out for exercise or other activities.
As a guide, rather than a fixed limit, 5 miles from your home would be within your local area. This is to reduce the risk that places such as beaches or popular beauty spots could become overcrowded."
It is suggested that travel to one's chosen destination for exercise or leisure should be on foot or cycle if possible.
There are exceptions to the "stay local" advice for people with specific health conditions. Examples are given such as autism or people who are wheelchair users who may need to travel further to access a suitable place.
Another reason to remain local is to make it less likely that someone will need toilet facilities while away from home.
Nicola Sturgeon said last Thursday and on Monday that she would consider seeking to put guidelines into legislation if it seems that easing restrictions risks an upsurge in the virus.
Police Scotland said they would have difficulty enforcing a 5 mile limit if it was legislation.
Scottish Government held an online public consultation in May. Framework document on moving from lockdown to normality in 4 phases. Friday 29th May was first day of Phase 1.
More consultation between Westminster government and English local authorities before announcing changes in England may have been helpful.