LONDON (Reuters) -British Prime Minister Liz Truss fired her finance minister Kwasi Kwarteng on Friday, replacing him with former foreign minister Jeremy Hunt, and scrapped part of her big unfunded tax cut plans. Truss told a news conference Britain would retain a plan to increase corporation tax and said her government needed to act now to reassure markets about its fiscal discipline. The pound fell against the dollar, trading down 1% at $1.1280, near the day’s lows. Sterling hit a record low and British government bonds, or gilts, went into freefall, after the government released its “mini-b…