The world’s largest iceberg is on a collision course with the British territory of South Georgia - potentially putting millions of penguins and seals in danger.

The trillion-tonne slab of ice, named A23a, broke free from its position last month and started drifting northwards.

The “megaberg” - which is twice the size of Greater London and 130 feet tall - is expected to approach the remote island off Antarctica in the next two to four weeks.