I doubt the sub-clause is valid, as the company is no longer Limited in the same way.
DB.
Company Limited by Shares is just an old term for Private Limited Company - the members (Hump and Oliver's trusts) liabilities are still limited only to unpaid debts on the shares they hold, but they amended the articles of association to officially take the company completely private to avoid having to publish accounts. The original articles effectively made the company private from the start as there were numerous restrictions on share transfer which made public trading effectively impossible.
Companies Act 2006 still enforces the removal of a director who has a mental health disorder making he or she a patient defined by the Mental Health Act, ie, sectioned, so there's hope yet!