After 29th March 2019 if you hire a car in an EU country, your driving license will not be enough and you will need to produce at least one, possibly two forms of international driving permits. The type of permit will depend on the country you want to drive in and typically cost £5.50 each.
The two different types of permit for driving abroad are:
International driving permit governed by the 1949 Geneva Convention on Road Traffic. It lasts for 12 months. Examples of countries who would want this are Ireland, Spain, Cyprus and Malta. You can get this permit from your local Post Office.
International Driving permit governed by the 1968 Vienna Convention on Road Traffic which last for up to 3 years. Examples of countries who would want this are Norway, Switzerland and current EU member countries. From 1st February 2019, most UK Post Offices will issue this type of permit.
The UK Government are currently negotiating to have the UK driving license continue to be recognised in EU countries. If it's not successful, they will try to gain individual agreements with EU countries.
Car insurance will also be affected. At the moment, if you drive your own car in the EU, your insurer has to offer the minimum level of insurance that is legally required. This means you get third party cover automatically and most insurance companies offer to upgrade to full comprehensive cover for a limited time for an additional fee.
If we have a no-deal Brexit, your insurance company will continue to give third party cover. However, you will need to show a Green Card. A Green Card is literally a green coloured document that shows you are insured to drive in a number of different countries. It is free but most insurers will charge a small admin fee. If you don’t have a Green Card, you may be fined and will have to purchase a ‘frontier insurance’ which can work out as an expensive option.
For more information, always check with your insurance company.