4.5 mi. A quick out and back that started and ended in the dark. My hotel is nestled on a side street across from a very big hospital. I ran on concrete sidewalks out of that neighborhood and into the downtown area of London. There were a few areas of construction, added to the chopped up nature of the sidewalks. It was like a trail run, I had to concentrate on where I was putting my feet down to avoid a pre-dawn wipeout. Glad I did a run, though, 57 degrees in a t-shirt, it easily could have been in a tank top!