The architect Sam Webb has never forgotten walking into the charred, smoke-blackened bathroom on the 11th floor of a tower block devastated by fire in July 2009.
In the soot-covered bathtub were the smeared imprints of the feet and hands of two young children. Along with their mother and another mother and baby, they had sought refuge in the small room after the fire spread rapidly across combustible panels on the block. All five of them died.
