I flew AMS-LHR. As I left the client site, there was a headline on the BBC ticker - we thought it was a stray light aircraft.

By the time we were airside at Schiphol, every television set was switched to the news, everybody staring in silence at the horrifying images.

The flight was subdued and uncomfortable. We were diverted due to closed airspace over central london.

I got home and phoned everyone. The evening was spent with a deep unease - at what might follow, whether more attacks, attacks on London, or an ill-judged reprisal that could spark something bigger.