"9/11" certainly changed the way I look at aircraft flying overhead. I work in a building next to the former site of the Baltic Exchange, destroyed by an IRA bomb. We hadn't moved into the building at the time but it was being fitted out for us. The explosion shifted the building a few inches and the pressure tore it apart from the inside. I used to dread to think what would have happened if it had been in occupation.

We have bomb drills where we all go and sit on the stairs away from flying glass etc. That would be no use against an aircraft crashing into the building. And the Baltic Exchange site? A very nice looking building is being erected there, one of the tallest in Britain. What a nice target it will make.

The world hasn't changed but people working in city centres are just a bit more insecure.