Seafront traders thrown into “turmoil” by do-not-swim warnings on two Kent beaches fear they could remain in place for years. The water at Littlestone and St Mary’s Bay on the Romney Marsh has been found to contain high levels of a bacterium that indicates the presence of human faeces. For the past 15 months people have been urged not to go into the sea at St Mary’s Bay, while the same advice was also issued in Littlestone in January after the water there was found to be polluted. It will remain in place throughout the year, but the Environment Agency (EA) has now admitted it cannot say when i…