As long as you have a full UK driving licence, you don’t currently need an additional licence to drive in the EU. This is likely to change in a no-deal scenario. UK travellers looking to drive in the EU on or after 29 March 2019 may need to apply for the relevant International Driving Permit.
These cost £5.50 and are available directly from the Post Office. The Government has extended the network of Post Offices where you can apply for an International Driving Permit, find your nearest branch here.
Check carefully which permit is required for each country you intend to drive within, as you may need more than one permit to comply with the law.
You need to make sure you have your International Driving Permit before you travel from the UK as you will not be able to apply for this when you are in the EU.
For more information please visit - https://www.gov.uk/guidance/uk-nationals-travelling-to-eu-essential-information.