Argh! I ran 23' and stopped, only had 5' to go but I was really hot, my throat was dry - it's not even that my legs were sore as they were fine but on this occasion, my mind took over and not for the best.
I will try again tomorrow, not beating myself up too much, I have come a long way and it is a minor set back. Funnily I managed 3 PR on this failed run!