Did you know that there are OSI's (Out Of Station Interchanges) which lets you have up to FORTY MINUTES of change time. I went to try it out, and also head for the Least Used OSI in the whole of London ...

ByTrain App: https://apps.apple.com/gb/app/bytrain...

Oyster/Contactless App: https://apps.apple.com/gb/app/tfl-oys...

List of all OSI's (and their times) on the Oyster Rail website: https://www.oyster-rail.org.uk/osi-list/