Upvote:9
I have a EU passport is this still valid in Britain?
Of course. Britain recognizes passports of pretty much every country in the world.
If you mean that you have a UK passport that says "European Union" on it, then yes, that too remains valid.
Also will a British Visa let me back into Australia?
No. You need an Australian visa to enter Australia.
Also I THINK my passport is valid until June 2027, how would I make sure?
Look at your passport. The expiration date is on the same page as your picture, name, and date of birth.