The trial has started into the deaths of four Warwickshire firefighters.
Ian Reid, John Averis, Darren Yates Badley and Ashley Stephens died after the fire at a vegetable packing factory at Atherstone on Stour in Warwickshire in November 2007.
Two fire officers have been acquitted of manslaughter charges following the deaths of four of their colleagues at a warehouse fire in 2007.
An investigation into the deaths of four firefighters who died at a warehouse blaze in 2007 cost £4.6 million
Expert witness says mistakes weren't made