So, for the walk.. I decided that the first time I looked at it, the first two numbers would determine how long the walk should be. The number was 292158, so I decided the walk should be 29 minutes long.
I also decided that the last number would have significance - if it was even, I would go right, if it was odd, I would go left. As it was an "8", I went right.
Then I concluded that the first two numbers would be how many paces I would take until I had to then go left or right. The number had changed, so my first number was "67".
This strategy didn't work very well, but still, I went for a walk and took some photos, so here are some of the photos:
Twickenham Studios:

I liked the way that this part of St Stephen's church looks a bit like plants with teeth:

Some sort of plant:

A chestnut I found on the way home:

The some sort of plant reminds me of Old man's beard, or 'traveller's joy', but not so much that I'm saying that's what it was, it also looks a bit like lichen.