Have a read of the item below which I've copied from elsewhere. Pegasus nearly came a cropper with this and it was only the vigilance of a travel agent that prevented us losing a lot of money...
🔴𝐈𝐌𝐏𝐎𝐑𝐓𝐀𝐍𝐓 𝐏𝐀𝐒𝐒𝐏𝐎𝐑𝐓 𝐔𝐏𝐃𝐀𝐓𝐄 𝐂𝐇𝐀𝐍𝐆𝐄𝐒🔴
Due to changes in validity since leaving The Eu , your passport is now only valid for 10 years from the issue date on your passport. If your passport was issued prior to the UK leaving the EU with additional months on, those extra months are no longer valid.
Passport issue date 21st Jun 2012
Passport expiry date 21st Dec 2022
Your passport expiry date is now the 21st Jun 2022
Most countries in the EU require that your passport is valid for 6 months on the date of return from your holiday , some countries it’s 3 months, meaning the last date you could return on the above example would be the 21st Dec 2021
I have seen lots of stories on the news of people losing thousands of pounds as they did not know about this new rule.
👇You can check if your passport is valid on the below link👇https://www.gov.uk/check-a-passport-travel-europe
Also worth noting that if you do need to renew your passport very quickly it is near impossible. The Premium service the passport office offer was booked solid for over two weeks and then the only appointment offered was in Belfast. If you persevere with Fast Track you might just make it but you need more that a week spare.
Another one of the joys of Brexit I'm afraid. Be warned