Well, after all the apprehension I went out there and nailed W4R1 this morning. Admittedly, I nailed it VERY slowly, but I didn't stop, which I'm actually very surprised about. I found the worst bit was the end of the second 90 minute walk as I didn't feel fully recovered before setting off on the last 5 minute run. The last run was still OK though and I soon found my rhythm once I'd started. So, 16 minutes run in total today! Serious progress since W1R1 three weeks ago today. Thanks Laura! Thanks fellow C25Kers!