Help for British nationals
Definition of a British national
UK nationals are defined as:
1) British citizens
2) Persons who are British subjects by virtue of Part IV of the British Nationality Act 1981, who have the right of abode in the United Kingdom and are therefore exempt from UK immigration control
3) British Dependent Territories citizens who acquire their citizenship from a connection with Gibraltar.
Commonwealth citizens with the right of abode in the UK are not "UK nationals" for EU (or any other) purposes.