Latest travel advice from the British Embassy in Paris
'There continue to be large numbers of illegal migrants in and around Calais, who may seek to enter the UK illegally. There have been recent incidents of obstacles being placed on to the road and items being thrown at vehicles on the approach to Calais Port from the A16 motorway. If this happens you should keep moving where it’s safe to do so, or stop and call 112 if it’s not safe to proceed. Keep vehicle doors locked in slow moving traffic in and around Calais, and secure your vehicle when it’s left unattended.'
Also this: the French government has launched a free smartphone app to alert users about possible security incidents, including all major natural, technological and terrorist-related risks. Users will be able to view alerts for up to eight geographical areas. The app, called SAIP (Système d’alerte et d’information des populations), is available in English and French. You can download the app by entering the term ‘SAIP’ in the Apple App store or Google Play.