CAIRO Feb. 1 — A British naval flotilla, including an aircraft carrier and helicopter carrier, entered Egypt's Suez Canal on Saturday bound for the Persian Gulf, port officials said.The vessels entered the canal under tight security and were expected to cross into the Red Sea later Saturday before sailing toward the Persian Gulf to join a U.S.-British military buildup ahead of possible war in Iraq.The British vessels were being accompanied by the American nuclear submarine USS Montpelier, port officials said on condition of anonymity.The forces include the biggest naval task group Britain has deployed in 20 years, consisting of the...