"British Airways flight BA010, operating Sydney-Bangkok-London Heathrow arriving on 15th April 2006, has diverted into Uralsk, Kazakhstan, following a technical problem."
Apparently, a group of bees in the cargo hold set off the fire alarm!
http://www.airliners.net/discussions/general_aviation/read.main/2721253/
And BA's official line
http://www.britishairways.com/travel/flightops/public/en_gb
Interesting