Thanks for your reply.
I’ve been doing some of these OSI’s when I’ve come down to London as I live in the Midlands.
I’m planning to walk them all just because I find them interesting.
So another question, I see on the Tube maps that there are some markings to show that you can walk between two stations in under 10 minutes but I’ve noticed that some are not in the OSI list.
As an example South Hampstead to Swiss Cottage.
Dose the OSI list have to have some sort of official status from TFL before it becomes an OSI and the others are just information?
I notice that it also works the other way around that some on the OSI list are not marked on the tube map, maybe not enough space.
Again as an example Paddington to Lancaster gate and Queensway to Bayswater.