If you visit Ralf's site you'll be able to see a great level of detail in the picture.
The second was sent by a regular commenter who would prefer to remain nameless and he saw it in The Times on the 15th October. Basically it's a mural in the offices of Marshall Wace, one of the largest hedge fund groups in Europe. (No, I have no idea what a hedge fund is - maybe it has something to do with topiary like in Little Britain)
Marshall Wace seem to be tube geeks and like the tube so much they commissioned a graffiti styled London Underground mural for their Mayfair offices.
I like the way the roundel on the Tube has their company name in it.