Firefighters using breathing apparatus practise in the unit to train against phenomena known as flashover and backdraught.

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His mother Linda Williamson, 69, from Kinross, and his sisters Rachel, 45, from California, and Rebecca, 41, from Stourbridge, in the West Midlands, claim watch commander Tim Foley did not recognise a warning of a potentially very dangerous "backdraught fire".

BBC: Ewan Williamson

Last year his mother Linda Williamson, 70, from Kinross, and his sisters Rachel, 46, from California, and Rebecca, 42, from Stourbridge, in the West Midlands, claimed watch commander Tim Foley did not recognise a warning of a potentially very dangerous "backdraught fire".

BBC: Ewan Williamson