PM vows to hit back if France breaks post-Brexit fishing agreement

No 10 threatens retaliation against French measures including port ban on British fishing boats

A major trade dispute has broken out between the UK and France after Paris banned British fishing boats from key ports, vowed to impose onerous checks on cross-Channel trade, and threatened the UK's energy supply over a row over post-Brexit rights to UK waters.

The move prompted a dramatic response from Downing Street where a spokesperson for Boris Johnson said the UK government would retaliate over what was a described as a potential breach of international law.