Art on the Underground: Spotted in the wild

Way back in November I bought a poster celebrating the 100th anniversary of the London Underground's Roundel. Rather than a one-off, it was a two-off plus extras: one for the underground's archive of art, one auctioned on ebay, and the potential for the image to appear on posters and tube maps around the capital.

A friend of mine spotted the one I bought at White City tube:

Surely that'll add a tenner to the value of the poster.

As for a technological angle to the post: my friend has an iPhone so had to email me the picture rather sending a MMS.