(Reuters) - British water supplier Severn Trent said on Wednesday it would pay a final dividend, while warning the coronavirus crisis was likely to lead to unpaid household water bills over the next year and a decline in sales to businesses.The company, one of Britain's largest water firms, proposed a final dividend of 60.05 pence, in line with policy and higher than the 56.02 pence it paid last year.Severn recorded a bad debt charge of 42.5 million pounds ($51.96 million), including 2.2..