(Bloomberg) -- Britain's new gambling law comes into force at midnight, legalizing U.K. advertising campaigns for the first time and licensing online casinos that can accept bets from gamblers worldwide including the U.S. William Hill Plc, Gala Group Ltd., and 13 other companies find out tonight if their virtual casino licenses have been approved to start accepting bets immediately, a spokesman for the Gambling Commission, the U.K.'s new regulator, said today.