Britain's High Court has issued a ruling stopping a planned strike by London bus workers over Olympic bonuses.

Thousands of bus staff had planned to strike for 24 hours Friday to demand a 500 pound ($780) premium for working during the 2012 London Olympic and Paralympic Games.

Granting an injunction sought by three bus companies, Judge Michael Supperstone said Thursday that the union had not complied with "statutory ballot and strike notice provisions."

The bus workers are the latest transit staff to demand extra money to work during the games.

London's subway train drivers have already secured one-time payments of 500 pounds ($780), while those who run the capital's bicycle rental network have also asked for bonuses.

The Olympics run from July 27 to Aug. 12.