Every year there are posts from stressed people who've realised, a little too late, that their (or their child's) passport has expired or doesn't have enough time remaining on it.
Now might seem like a great time to check everyone's passports and make sure there is enough time left on them (many countries require 3-6 months of unexpired passport - Europe is typically 3 months, US possibly 6 months).
"Do not book travel until you have a valid passport - your new passport will not have the same number as your old one."
Renew or replace your adult passport
https://www.gov.uk/renew-adult-passport
Getting your first adult passport
https://www.gov.uk/apply-first-adult-passport
Get a passport urgently
https://www.gov.uk/get-a-passport-urgently
Get a passport for your child
https://www.gov.uk/get-a-child-passport
Happy future holidays!
Jo