nationality: british or britain?

[Boyeooe1218]

If you see this in a listening test, what would you fill in?

Nationality:__________(British/Britain)

I am of british nationality.(Is it correct?)

I am a british/ I am british.(Are they the same?)

[Beeesneees]

I would use a capital letter whichever I filled in.

Nationality: British.
I am of British nationality.
I am British. ('I am a British' is not correct)
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Cheers m' dears!

[Boyeooe1218]

[Beeesneees]

I mean that Britain and British should always begin with a capital letter. Your examples didn't.

I used the future in the past:
http://www.englishpage.com/verbpage/futureinpast.html
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Cheers m' dears!