Are you really running 6:30 miles? Must not be much London obstacles in your way!
I pick routes that make it so I don't have to stop. I've found a 3 mile, 4 mile route with no crossings and a 5 and 7 mile route with just one. It's not quite like Milford though, where I've got a 13 mile running trail next to the farm...
I was about 20s a mile faster when I was in the states in June. The beer in Maine must have done something to me