Shares in Trinity Mirror rose after the newspaper group confirmed that it was considering whether to buy the Daily Express from Richard Desmond’s Northern & Shell group in a move that could increase the turnover of the Daily Mirror owner by a quarter. The newspaper group confirmed to the stock market yesterday that it was “at an early stage of evaluating certain of Northern & Shell’s assets”, its shares shooting up as much as 3% after The Times revealed that the two sides were in talks.