One week into my new job at TRW Advertising, I have fallen into a comfortable routine. I wake up early each morning, drink a cup of coffee and eat my breakfast in bed before getting ready for work. Living in the city means that driving is always somewhat impractical and so I get the tube to work each day, reading a trashy novel on my kindle as I sit on the train.

Every day, I smile at the attractive, blonde guy who always seems to get the same tube as me and he always smiles back. ...