LONDON (Reuters) - Losses at Britain's Co-operative Bank increased in the third quarter in the face of ongoing competitive pressure in the mortgage market and a 60 million pound ($77.03 million) charge for mis-selling loan insurance.The lender posted a pre-tax loss of 118.6 million pounds for the period, compared to an 87 million pound 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...