Travelling eastbound on the Jubilee Line, I've been wondering whether it is quicker to change trains at London Bridge or Canada Water when heading home if you don't know the times of Overground or Southern trains.

I thought I would share the results of my ponderings.

Without giving all the workings out, starting from the Jubilee Line platform, I make the average journey time to Honor Oak Park 21 minutes via Canada Water and 24 minutes via London Bridge. Best time via London Bridge is 16 minutes, via Canada Water 17.5 minutes, but the downside is that if you just miss a train, the worst time via London Bridge is 32 minutes, Canada Water 27.5 minutes. I conclude that it is almost always quicker to change at Canada Water.

These calculations assume you can make the change at London Bridge in 5 minutes. This is the figure used by the TfL journey planner but seems very optimistic to me. I used a figure of 2 minutes for Canada Water which is probably pessimistic. I used a 15 minute train interval from London Bridge and a 5-5 10 minute interval from Canada Water.