W4r2 completed today, and I felt splendidly great.
I have new 'running' shoes to thank. Last week I started to feel some pain in my shins, and had my gait analysed. Apparently I am a 'natural' runner, but tended to land heavily. The shop showed me how to run with a shorter stride, land on my midsole and be more stealthy in my running.
Result - new PB compared to W4r1, no pain in my shins and loving my running! Come on Saturday, I want to go out again. Loving this new 'stealthy' style of running, it is much quieter.