Bienvenida a CALLY

I found myself smiling on the Stanstead express. I couldn't help myself.
Watching the BT tower, the gherkin and east london high risers as the train crawled into the city, I became that person who sits alone, grinning on public transport. I quickly stopped, and put on my london face.

The smile returned however, on viewing this sweet and random sign in Cally tube station.