You thought I was in Italy? Me too.
I was on the Stansted Express, and that vague feeling I'd had all day of having forgotten something was realised: I'd left my passport at home. A high-speed cab chase across London ensued, until we hit a traffic jam in Hampstead, and it became clear I'd never make it back to the airport on time.
Ah well, London is a lovely city in which to spend your week off.