It wasn't you're fault - but the gremlins must have hidden my headphones as I couldn't find them anywhere. With the aid of mapometer and calculating roughly my walking speed and running speed for W3 runs, I planned what I thought would be a walk/run as close to W4 schedule as possible.
Weather was a balmy 4 degrees, so no frost or ice on the pavement which was a relief. The first 3 min jog was easy and I much preferred the shorter walk afterwards although towards the end of the first five minute jog I was ready for the walking segment. The second half seemed easier - possibly because I didn't get so cold on the walking parts. I also chose a different route today and I think the footpaths were a better surface to run on than the usual uneven pavements.
Be interesting to see how I get on with Laura for timed W4 run - assuming I can find my headphones!