Yeah I had to go back to work before finishing my post 
Form a selfish point of view we would love for the DC to be able to see my parents (both under 70). However we think that it's highly unlikely that will happen. It isn't planned til the 2nd half of July though.
From a country point of view, I'd rather we didn't have loads of British tourists turning up here.
We too have been looking at the 100km. Going to start small though, just somewhere we can walk to and take a picnic and enjoy being outside longer than an hour!!!