Having been concerned about the jump from 9 minutes to 16 minutes of running, I had half talked myself into repeating W3 before moving on. But thought that first I'd give the w4R1 a go before deciding......So pleased I did. I didn't struggle at all with the jump in running time. No going back a week for me now.
Still getting that ache in one of my calves, Only now just discovered that it is running up inclines that brings it on again (even though it was extending my stride too much which originally caused it). So now I will avoid the steeper slopes for a week or so and carry on with the post exercise stretches.