What Abigail Did That Summer (Rivers of London, #5.3)

by Ben Aaronovitch

If you run everywhere you miss stuff that you might have been better off noticing – just saying.

I was going to spend this evening making an isochrone map of the area around the Heath. It’s from the Greek isos meaning equal and khronos meaning time, and basically you work out the area you can reach travelling by a certain mode for a certain length of time from a single point.