you may not have gotten a shot of that solitary trainer (which I actually quite liked by the way

LOL.., it could have been a more interesting foreground object, yet I was struggling to find anything, even used a used rubber wrapper.

although, I certainly would not have been crawling through the tunnel.

The tunnel was made of wood and didn't look very safe to me, thus the reason for the wall route. Falling horizontally is much more fatal than feet first if you get my meaning.. 😀..

you don't mention rats very often, you must see plenty,

Only in Huddersfield. It's crawling with them, otherwise they are a rare sighting.