NigeB
Thank you!
However, I doubt a fuel tank explosion per se
Aviation fuel has to be in a critical state for it to ignite - ie - atomised - with the correct amount of fuel, air, temperature and pressure
If I threw a lighted match into a dustbin of Avtur at ground level, the match would extinguish
Most likely culprit - the galleries between 7a tank and the wing tanks and close to the source of the fire - all of which would have been primed