A second gambling giant has entered the battle to run Southampton’s super casino. Grosvenor, the UK’s biggest casino operator, has announced it is set to launch a bid to run the complex at the proposed Royal Pier development. It will compete with Aspers, and there is likely to be further interest in running the casino over the next few months. Southampton has one of only eight licences in the country to run a super casino, which could have up to 150 slot machines and 30 blackjack and poker tables. But there are currently only two super casinos in the UK…