Photo credit: poferries.com/en/calais-dover
UK driving licences may not be valid in certain EU countries after 29 March 2019 - that is in the European Union and Iceland, Liechtenstein and Norway.
If the decision is that Britain leaves the EU without securing a deal, driving across certain countries in Europe may only be possible if British citizens have an International Driving Permit (IDP) for the countries in the European Economic Area (EEA).
According to bbc.co.uk British citizens going to countries in the EEA will need an IDP Driving Permit except for driving in the Republic of Ireland. (bbc.co.uk/news)
"If you are a UK licence-holder living in another EU country, then you need to exchange your UK licence for a licence issued by an EU country, before the UK leaves. If you wait until after the UK leaves, then you may need to take another driving test." (bbc.co.uk/news)
Also via bbc.co.uk/news: