BBC running report of several holidaymakers being turned back at airport gates due to new passport rules that apply since Brexit.
It doesn't help that airlines allow passengers to check in online with no mention of the ten year from issue rule.
To summarise: Passports are only valid for ten years from issue, any time added from previous passports is no longer counted so the stated expiry date is irrelevant. The amount of time that must remain after the trip various depending on destination.
This is for Europe. I'm not sure about travelling to other areas.
Travellers share their experiences of getting caught out by the EU's 10-year-passport rule.
www.bbc.co.uk