British Prime Minister John Major, burdened by the Persian Gulf war and big domestic problems, now has a cold to contend with. The trouble began during the weekend when Major started losing his voice while meeting in Bermuda with President Bush. Major went to a local doctor who told him he was suffering from an ear and throat virus. "His voice is still a bit croaky Monday," a Downing Street spokesman said. "He had a cold earlier in the year that he never properly got rid of." The spokesman denied the virus is stress-related despite the prime minister's hectic schedule, which has taken him to Moscow, Bonn, Kuwait and Bermuda in the past two weeks. Later this week, Major must oversee the presentation of a budget to Parliament and a debate on the controversial poll tax.