Britain dusts off war plans amid calls to send a nuclear submarine after Argentina joins forces with Brazil and Uruguay to blockade islands

Military chiefs are dusting off their plans for the defence of the Falklands after South American countries banned ships from the islands docking in their ports.

Sources fear Prince William's six-month deployment to the South Atlantic as an air-sea rescue pilot next year could provoke more sabre-rattling.

Yesterday Argentine President Cristina Fernandez de Kirchner claimed Britain was ready to use its military to steal natural resources 'anywhere, anyhow'.

She said: 'They're currently taking our oil reserves and fish stocks from the Falklands but when they need more natural resources they will come and use force to steal them wherever and however they can.'

Mercosur, the South American trading block which also includes Brazil, Uruguay and Paraguay have agreed to ban boats sailing under the Falklands flag from docking at their ports – even though Paraguay does not even have a coastline.

The ban affects around 25 ships – some of which are fishing vessels working for a Spanish company. Read More