Too good an opportunity to pass up. Snapped on the tube from Heathrow.
NB This photo has been copied from this site and used widely without permission or attribution. If you spot it anywhere around the internet, please let me know in the comments below.
Several years after this photo was taken, I wrote about how often I see it reused without attribution or by someone claiming credit for it.
NB: whenever I discover this photo has been used in print or online without my permission, I submit an invoice for use.