British English vs self-centred

British English is a noun but self-centred is not a noun.

Word	Noun	Adjective	Verb	Adverb
British English	Yes	No	No	No
self-centred	No	Yes	No	No

British English (noun)	self-centred (noun)
English as spoken in the UK

British English (adjective)	self-centred (adjective)
	concerned chiefly or only with yourself and your advantage to the exclusion of others