Originally Posted by
Roger
EU+ countries often allow expired passports up to 6 months after expiry, but it seems that the BA person was correct.
This website -
http://www.qantas.com.au/travel/airl...bal/enNational - shows:
Wouldn't it be great if all citizens of a single market plus some neighbours could travel without passports? But wait ... they can, except on flights to/from GB/IRL/DK.

https://www.gov.uk/foreign-travel-ad...y-requirements
Possibly a more reliable source than Qantas