After failing week 6 run 3 last time, this time I tried week 6 run 2. After lots of lovely advice from people on this site, I did a warm up walk of 10 minutes instead of 5 - just restarted the podcast as soon as Laura said it was time to run. (Certainly needed to warm up today, it's -1 here in Dorset.)
Anyway I made it! I think I will do it again at the weekend before moving on to week 6 run 3.