The Duke of Edinburgh has officially opened the Indonesian-inspired Tiger Territory at London Zoo, which will be home to endangered Sumatran tigers Jae Jae and Melati.

The £3.6m project has seen the tigers' home expand five fold to 27,000sq ft (2,500sq m) and has been designed by the conservationists and the zoo's tiger keepers.

It includes towering trees and a custom-built swimming pool and is the zoo's biggest investment since the opening of Gorilla Kingdom in 2007.

The Duke officially opened the exhibit on 20 March, unveiling a plaque to commemorate the occasion, before it officially opened to the public two days later.

The tigers were genetically matched and brought from opposite ends of the earth to their new home at London Zoo, where there are high hopes for them to begin breeding.