Mapping the Tube 1863-2023 – A chronology of Harry Beck's (and others') London Underground maps at The Map House, 54 Beauchamp Place
One for fellow map nerds and London Transport fans. There is an excellent exhibition at The Map House showing the evolution of the tube map, the like of which I am not sure has been seen before.
In the gallery room at the rear of the shop there is an arrangement of framed pocket maps that clearly shows how the tube map has been adapted as new routes and stations have been added to comply with Harry Beck's original design.