Colin, you missed the Part 1 add on. I had to ride home as wellYou were short by 740 metres!
I sometimes find myself touring the local streets to add that kind of distance to complete one of my challenge rides. It always feels a bit silly because it adds nothing to my fitness, pleasure or achievement, but it enables me to say that I had completed the distance.
In your challenge, it is about just making the effort to go out so a few metres here or there makes no real difference.
Day 7. 51km