Checklist for application.
 

Ok so going through the checklist for my wife’s applicatio , copy of bio data page from passport for myself British citizen. No problem. Then top one says one proof of British citizenship from myself such as passport. Is that not just the same as the copy of the bio data page from the passport, or are they actually wanting my passport. Surely it’s just that photocopy of that page again is it not??

Re: Checklist for application.
 

Your passport covers both requirements. One copy is fine.