(Reuters) - Britain's stock markets gained on Tuesday as signs of the coronavirus infections easing in worst-hit regions of Europe boosted gains in oil, mining and battered travel stocks. The FTSE 100 rose 2.1%, extending gains for a second session, as the hardest-hit Italy and Spain looked to relax lockdowns after steady declines in fatality rates, while the outbreak showed signs of levelling off in New York."The falling cases in Europe are giving investors hope that lockdown could come down..