LONDON (Reuters) - Britain's Co-operative Bank posted a pre-tax loss of 152.1 million pounds for 2019, after tough mortgage competition and payouts for mis-sold loan insurance continued to weigh on the lender.The bank posted a 140.7 million pounds loss the previous year.Co-op Bank has been working to turn around its finances since its near-collapse and rescue by a consortium of U.S. hedge funds in 2017.The bank said its underlying loss of 19.7 million pounds was in line with expectations. It..