Hundreds of foreign motorists have been allowed to speed on Britain's roads with impunity because police cannot trace the drivers of vehicles from abroad, a constabulary has admitted.

A loophole in European laws has meant that a total of 400 motorists from mainland Europe have escaped prosecution despite their cars being photographed breaking the legal speed limit by enforcement cameras on the M20 in Kent.

Damian Green, the local MP, and the RAC Foundation have condemned the inability to prosecute dangerous foreign drivers claiming it sends the wrong message to motorists visiting the UK.

The contraflow on the M20 was imposed for a seven-week period between April and the end of May as part of Brexit contingency plans.

Traffic was reduced to two lanes and a 50mph speed imposed on the London-bound carriageway.

While more than 900 British drivers were given £100 fines for exceeding the limit, 400 foreign motorists caught by the cameras escaped a fine or prosecution.