Independent (UK): The environmental nightmare unleashed by the crippled BP oil well in the Gulf of Mexico crept further into the white-sand paradises of Florida yesterday with officials announcing a swimming ban along a six-mile stretch of popular lido while researchers warned of mass lay-offs in the state’s all-important tourism sector this year. The damage being inflicted on BP itself meanwhile continued to worsen as shares in London fell another 4 per cent in nervous trading that reflected the …