Media playback is unsupported on your device Finding a design for a post-Brexit UK passport
31 March 2017 Last updated at 14:51 BST
For some people the most obvious sign that the UK has left the EU will be the front cover of our passports, which will no longer have to bear the words "European Union".
There have been calls to go back to the dark blue cover of old but an online design magazine is running a competition to see if there are any other ideas out there.
Adam Fleming reports for the Daily Politics.