William Hill has commenced a review of its media planning and buying arrangements.

The account has been held by Dentsu Aegis Network’s Vizeum since December 2011, when the agency pitched against WPP’s MEC and Ominicom’s Manning Gottlieb OMD.

Vizeum is understood to have been invited to repitch for the business.

The review comes ahead of sizeable changes to the gambling business in the UK. The gambling and betting industry has voluntarily agreed not to advertise during live sports on TV before 9pm starting from the summer.

The UK is William Hill’s biggest market, but the company has set out ambitions to become the number one player in the US, which is undergoing a state-by-state deregulation of gambling laws.