Go here
http://www.smartcockpit.com/pdf/flig...nfactors/0009/
Open the file, its a pdf ... How To Deal With An In Flight Fire, by Bill Melvin ... thought provoking reading.
I personally would do the drill, then go and have a look wearing oxygen mask/smoke hood to see if it was a real fire ... if it was, then consider ditching ... the situation 'mid Africa' at night 500 miles from an airfield poses an interesting dilema.