By Sruthi Shankar and Johann M Cherian (Reuters) – Britain’s main equity indexes managed to eke out gains for the fourth-straight day on Tuesday, boosted by the reversal of the government’s unfunded tax cut plans and optimism over the earnings season that boosted U.S. stocks. The blue-chip FTSE 100 closed 0.24% up and the domestically focussed FTSE 250 ended 0.15% higher. Britain’s new finance minister, Jeremy Hunt, on Monday scrapped Prime Minister Liz Truss’s economic plan and scaled back her vast energy support scheme to try to stem a loss of investor confidence. “The UK government has esse…