I think I might have got this now! I've been out another 2 times since my last post making it 6 x 30 mins constant running. I went out on Friday morning which was a bit windy with 30mph gusts and some sideways rain but not as bad as it got later in the day. Pic included of the damp friendly stone still marking the way!
The next run was on Sunday and I think I started the apps in the wrong order which made the C25K shut down. After walking for 7.5 mins I realized it hadn't told me to start running so i had a bit longer warm up while I restarted the app. On the return leg I was nearer home than I would usually be so instead of stopping after 30 mins I ran through the cool down and got to 5k. It took just under 40 mins and felt really good and the next day all felt fine as well!
I think tomo calls for another run. It's getting addictive!
I also really like the collage app recommended, it's easy even for a non techy person like me π