Well after a lot of faffing around bemoaning the planning of the running intervals in the middle weeks and considering alternative approaches to W5 & W6 that didn't involve a huge jump from 8 minutes of running to 20 minutes, I actually did what I was told (for once) and decided to give the 20 minute run a try.
I have to say the ONLY reason I did it was due to some very strong minded women on this forum. First MissWobble's instruction to "Just do what you're told" put me on the back foot a bit. Then I realised I was in big trouble when JuicyJu started her comment with "Right!" and proceeded to tell me to just get on with it too.
The one that swung it though was from Dewines who is somewhat older than me and with a list of very valid health reasons for not even attempting such a stupidly long run after just 5 weeks of training, but who despite her serious trepidations had gone out and and done it. That really left me no choice.
So I loaded up the new playlist, set the app to 5 minutes per km and off I trotted, wondering how far I would get. I was really very surprised to get all the way to the end of 20 minutes without stopping, without pain and just inside my 5 minutes per km planned pace. It just goes to show, this programme really does work - amazing.
So a big thank you to all you equally amazing ladies who cajoled, bullied & shamed me into doing it. I would not have done it but for you.