Conservation experts are to reverse five centuries of British history and deliberately allow rising sea levels to flood a huge stretch of reclaimed Essex coastline. In the most ambitious and expensive project of its type, the RSPB intends to puncture sea defences around Wallasea island, near Southend, and turn 728 hectares (1,800 acres) of farmland into a mosaic of saltmarsh, creeks and mudflats – making mainland Britain just a little bit smaller.
