Thanks to everyone on here who made me feel better after I couldn't complete W7R3. I went back out and did it on Wednesday and then promptly failed yesterday to finish W8R1, but I felt okay about it. I managed about 10 minutes before my calves were so tight I couldn't carry on. I did start again for about 6 minutes in the middle, but I struggled up the hill just walking home, I may have made a mistake reversing the route, and going out straight from a morning of work, without lunch. It was also really warm so I had my top round my waist from the end of the warm-up walk, which is really annoying. I'll try again tomorrow with fewer layers, after breakfast, and in the same direction as Wednesday.
Thank you everyone on here I really could not do it without you