Officials knew FOUR years ago about toxic gas blamed for death of boy in Surrey floods: Environment Agency protected their own building...but didn't tell boy's family living right next door

Seven-year-old Zane Gbangbola was overcome by fumes as he slept
Floodwaters filled basement of home in Chertsey, Surrey in February
It's emerged authorities were aware of potential risks from ground gas
Council papers from 2007 say ground could contain 'harmful substances'
Revelations are latest twist in eight-month battle by Zane's parents

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