Apparently in Bangkok they locked out one of the two fire detection lines due to a fault. Then diverted due to a fire warning in the hold. The airport they've landed at doesn't have much in the way of facilities...the runway isn't big enough for the 744 to get out, the steps for the pax aren't high enough, the terminal can only handle around 100 people and there are no cargo facilities...and to top it all off, the fuel at the airport is contaminated. They've sent out 2 airbuses to bring back the pax and they're stripping the 744 (G-BNLA) to get it out.