Originally Posted by
corporate-wage-slave
However if the UK becomes fully Third Country on 29 March then the worst case scenario is that there is a 90 days maximum visit per rolling 180 days. So if you are not spending that amount of time in the EU (excluding Ireland and transit to Sovereign Bases) then you can stick to your UK passport through out.
Isn't there a rule that if you're entering a country you are citizen of, you must use that country's passport?