River Wandle oil spill has 'undone decades of work' to return wildlife to London river, MP warns

An estimated 4,000 litres of oil spilled into the River Wandle - (Supplied)

Thousands of litres of oil which polluted a rare chalk stream in south London has undone “decades” of environmental work, an MP has said.

An estimated 4,000 litres of oil spilled into the River Wandle on Tuesday, home to wildlife such as brown trout and kingfishers.