I’ve walked 8 miles today, all within this 500m radius of Battersea Arts Centre. Hard to imagine you could do that really. I am also aware I need to decide whether to ditch imperial measurements at this stage.
The total number of locations is now 232. I think the key reason is that the area is mainly residential with only a few major roads cutting through. Having said that, one area which was well away from the roads was too noisy to hear a pin drop, due to a flock of sparrows living in the hedge.