It is not easy to describe the layout at Baker Street if you have never travelled through it, so I won't try. Suffice it to say that this most important station on the Metropolitan has many platforms and modes of communication between them. Recently some of the staircases have been made one way - fine if you want to go that way, awkward if your normal route is blocked because it may require a detour going up and over the platforms. I gather that there is some serious escalator replacement work going on and the one way system is a safety measure. But being unable to go directly down to platform 2 from the main entrance this afternoon was very strange, considering that nobody was coming up the stairs.
I probably won't be doing much travelling beyond Baker Street in future so my progress reports on the improvements will be no more than occasional.