Well, after a full day's work and running up and down stairs last night I decided to run after work. Definitely had to grit the teeth for the whole run but I made it through. I've been doing evening runs on the basis that the foot paid that I have mentioned in other posts, will be easier after a good nights sleep. The theory is fine but the practice is slightly different.
I was hard and it continues to be hard but the only thing that keeps going round and round in my head is that I can do it and I will do it because I'm doing anything that I have not achieved before.