The UK has sent two offshore patrol vessels ‘to monitor the situation’ in Jersey amid a row with France over post-Brexit fishing rights.

France earlier threatened to cut the island’s electricity off while French fishermen threatened to blockade the main port of St Helier to prevent supplies from being delivered.

Downing Street confirmed Boris Johnson spoke to Chief Minister of Jersey Senator John Le Fondre on Wednesday evening about precautionary measures thy could take.

‘The prime minister and chief minister stressed the urgent need for a de-escalation in tensions and for dialogue between Jersey and France on fishing access,’ a Downing Street spokesman said.

‘The prime minister underlined his unwavering support for Jersey. He said that any blockade would be completely unjustified. As a precautionary measure the UK will be sending two Offshore Patrol Vessels to monitor the situation.

‘They agreed the UK and Jersey governments would continue to work closely on this issue.’

UK sends navy vessels to Jersey after France threatens blockade in Brexit row