Confirmation Of British Status

I am interested in the claims recently by my aged father who at one time was resident in the UK that he had a British passport.
He confessed having misplaced the passport hence my intention to confirm his claims.
How do I go about this or can you help.What information would you require?

Go to this website:

http://www.ukba.homeoffice.gov.uk/briti ... tizenship/

And look at the links listed at the right side of the page. There are forms and guides for confirming British citizenship (Form/Guide NS) as well as a form (NQ) for confirming non-acquisition of British citizenship.

Hope that helps.