Taking on board the support and suggestions here, I took a look at Galloway and decided that I would aim to do Run 2 walk 1 at Robin Hood.
And if I am going to try to do that I'd better try it out first!
So Saturday morning I was up before the visitors were stirring and went out for four miles - starting with a warm up walk and then setting the garmin to beep at 2 minutes, 1 minute, ran walked it.
As Pixie has said elsewhere it is a bit strange walking when you don't need to but I stuck with it and it was much happier when i came home after 4 miles. [I did have to do run 1 walk2 on a particularly steep bit coming home.]
This morning, Monday, was to be my long run, as the visitors had gone. Initially I had planned to do 12 miles, but it is now too close to RH - less than 2 weeks - for that to actually have any effect on my fitness for the race, so I decided to go out for just 2 hours and do the RW again.
Warm up 10 minutes and then into the R2W1 again. I kept it going well, calling at the gym for a drink after an hour and then coming back.
It was more of a struggle to keep it going on the uphill bit coming home and became a bit unstructured for a couple of reps and while I switched to R1 walk 2, and then I was home. I felt a much happier bunny than a week ago and 8 miles done (under 2 hours as it turned out).
I did this without my usual get up 2 hours earlier and eat. Juts some juice before I set off. Rather hungry after 1.5 hours -maybe that affected my struggle up the hill too.