TD, I have been informed from various sources that XV230 suffered a wing root fire before the explosion. It would fit with a problem with tank 7. Further to Sooty's post, there is no reason why MRA4 could not have a fire extinguishant for the bomb bay. The bomb bay in MRA4 is now split into 2. So in theory you could have 1 extinguishing systen covering both bomb bays. All it needs is money and time to test. Something the RAF Top Brass don't appear to have. All hangs on the BoI now, because the RAF does not do "Top Brass" leadership any more.