martin j wrote:
Wonder if anyone here can shed some light on this.
My colleague was checking both TFL's travel planner and National
Rail's website for transfer times for a Saturday AM between the above-
mentioned stations. TFL were pretty optimistic, quoting just over 20
mins, using Jubilee to Baker Street, then Bakerloo.

In addition to Paul Corfield's points, I should point out that if you
consider the Journey Planner time as your time from point A-B, you are
inherently assuming that you will arrive at the platform just at the
instant the train arrives. As you know this is unrealistic, so you
should add at least the time between services at that hour, which is the
maximum time you will have to wait.

I don't trust the National Rail journey planner estimates for Tube
journeys. It doesn't know what the TfL journey planner does.
--
Michael Hoffman