Last week I was refused a cab from the south side of Blackfriars Bridge to Leicester Square, because the driver said it was "too busy" in central London right n

Last week I was refused a cab from the south side of Blackfriars Bridge to Leicester Square, because the driver said it was "too busy" in central London right now. (Fortunately the cab behind him accepted us, and it didn't seem "too busy" at all.) Didn't know this rule applied, thanks!