Right. Having eventually got out of the City via a very long walk home (we had to stay in the office on police advice and watch the death toll unfold over the internet) I can't put it better than Ken Livingstone. So.
"This was not a terrorist attack against the mighty and the powerful; it is not aimed at presidents or prime ministers; it was aimed at ordinary working class Londoners, black and white, Muslim and Christians, Hindu and Jew, young and old, indiscriminate attempt at slaughter irrespective of any considerations, of age, of class, of religion, whatever, that isn't an ideology, it isn't even a perverted faith, it's just indiscriminate attempt at mass murder, and we know what the objective is, they seek to divide London. They seek to turn Londoners against each other and Londoners will not be divided by this cowardly attack".
Very near my work, in the heart of the City, is the plaque commemorating the spot where the first bomb fell on London in 1940. It was funny how I'd never noticed that plaque before tonight. We've been here before - indeed, bombings were a constant here during my childhood - and, um, we shall overcome.
I'll be back on the London Underground as soon as they let me.