From Oakwood, we journey down the Piccadilly to Holborn, change to the Central eastwards to Bank where we losefailing_angel for the afternoon, as midnightxpress and myself change to the DLR to get to Custom House for the Boat Show at Excel. 

Descending to the DLR platforms, interesting signage at the entrance to the surprisingly narrow corridor downwards.  This isn't at an exit to the outside world, but deep in the bowels of the Bank Complex, or maybe the complex is so tortuous to navigate, a narrow corridor is just too tempting for full-bladdered city types.