So, today I decided to go to my local parkrun and do my W7R1 there (25 minutes) and then walk the rest of the way round; thing is, I kept going and ran the whole 5km route! I was last (I am fairly sure that the tail runner walked behind me!) but I did it! My time by my reckoning was 49:12 - my goal today was to complete it in under 50 minutes but was assuming that I would walk/run the bit after my allotted running session.
I know I still have a couple of weeks of the program to go but I'd really love to get to 45 minutes for my parkrun time by the time I get to the end - I'm going to try to get to parkrun every week now as my third run of the week and see how I get on!