I successfully completed both Week 1 and Week 2, but after week 2 I had sore knees. By sore I mean they were a litte tight at the back and 'twingey' if I twisetd them slightly. I am not sure if it was related to running or cycling. that was 19th April.
I decided not to run the following week, but that weekend (26th - 28th) happily walked 40+ miles with friends, and had no trouble at all. I wore knee supports on Day 1 (13 miles), but not thereafter.
I am thinking of restarting the running tonight, so should I go back to Week 1, or back to Week 2. I feel fine. Week 2 was, by the end of the week, not a problem for me.