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Dear All,

My Child British passport will be expire after 11 months. How long before can I apply for his passport renewal application?
Thanks in advance.

You should be able to renew from now to anytime after expiry.
If you apply now the remaining validity period will be "lost", i.e. not added to the new passport's validity.
This is the link I have got, specifically for Europe but may still be useful: https://www.gov.uk/guidance/passport-ru ... -to-europe or here: https://www.gov.uk/foreign-travel-advic ... quirements