If you write to the UK passport office they will be able to confirm the passport number. We had to do this for my parents for the passport they used in 1972
Can you elaborate on the contact to UK passport office as I can't find anything online on their website and I have the same problem?
Old Passport number request
in Visa Chat
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Can you elaborate on the contact to UK passport office as I can't find anything online on their website and I have the same problem?