The Queen and the Duke of Edinburgh opened a new lion enclosure at London Zoo, and at least one of the big cats appeared to think lunch had arrived early.

Behind the Queen's back, an Asiatic lioness licked her lips a few metres away from the royal guests as she looked at the VIP visitors. And when the zoo's boss tried to make a speech, the Queen and the Duke were distracted by the sound of two young twin lions growling as they fought over a scrap of meat.

The 2508sq m Land of the Lions enclosure, which is five times the size of the previous enclosure, includes an overhead walkway, re-creations of an Indian train station, abandoned forts, a crumbling temple and an Indian high street.