Long strings of human faeces, dumped into the River Thames by the Thames Water water company, bobbing merrily along on the spring tide.
"Cor blimey Alfred, there's an'ell of a lot of Thames Eels on the spring tide!"
"Yeah Mildred, Thames Water are clearing their sewage works pipes out by flushing into the Thames, so they can pay more dividends to shareholders, rather than spending our water fees on fixing the broken sewage system "