Just had this from my mums insurance company ( I look after it for her, so emails come to me). Note the 4 week thing. Just incase !!
Whilst uncertainty remains on whether the UK leaves the European Union without a Withdrawal Agreement (a 'no-deal Brexit') on 29th March, if they do, UK motor insurance customers driving in the European Economic Area, Andorra, Serbia, and Switzerland will need physical proof of motor insurance when they travel. This is called a Green Card.
We have now developed a smooth and seamless process for you to obtain a Green Card if you are planning on driving in the European Union on or after 29th March 2019.
We will not charge you for this Green Card and it can be obtained by following the steps below:
Login to your My account
Select ‘Request Green Card’ from the My account homepage
Follow the on-screen instructions
Please be aware that there is no digital version available, a physical Green Card is the only valid format.
Your request will be processed within 24 hours of receipt and sent to you in the post the next working day, first class. We recommend requesting your Green Card up to 4 weeks before you travel.