Oh dear, I was actually talking about a completely different walkway collapse, the one at
http://www.hse.gov.uk/press/e00013.htm two years ago.
Somebody once said to me that there were two differences between a Doctor and an Engineer. One was that a Doctor could bury his mistakes and an Engineer had to live with his. The other was that Doctors can only kill one person at a time.
Yet more evidence, as if it were needed, as to the need for rigour and crosschecking in our profession!
G