Just found this thread, I did week 6 run 1 yesterday, run 2 tomorrow! I have very bad asthma and had to repeat week 1 and week 2 twice each, but since then I've found it much easier. Week 5 run 3 was a big step up, I never thought I could do it but I did!
I didn't know about the NHS version until now, I use an app on my iPhone called GetRunning which speaks to you above your music and tells you when to run/walk. It's very encouraging haha!