4.1 Membership is open to UK citizens and resident foreign nationals over the age of 16 years who share its aims and who are not members of any other political party or organisation membership of which the National Executive Committee ("NEC") has declared is incompatible with membership of the Party. Associate membership may be made available if thought appropriate to persons not qualified under the preceding sentences.
PROHIBITION AGAINST EX-BNP MEMBERS FOUND ON ITS WEBSITE
Membership is not available to anyone who is or has previously been a member of the British National Party or the UK First party. Any applications made from people who are or have been members of these organisations will be refused, and any subscriptions collected will be refunded.
By applying for membership you certify that you are not and have never been a member of either of these parties.
The legally trained such as Paul Oakley (now of UKIP though for years a Conservative) will be aware of the term ultra vires as well as retrospective.
Ultra vires - exceeding the powers on which it relies
Retrospective - making something an offence when it was not previously, thus making something that was previously legal illegal and punishing an individual for doing something that was legal when he or she did it.