Original founding directors 

You claim: - "I don't think a school prospectus is a reliable source." How so? Surely a school knows who its Board of Directors is?  Not only is it a direct source but by law (in the UK) the information MUST BE CORRECT. To name directors who are not in such a position is a criminal offense under the Company (Disclosures) Act (1985/6 revision and 2002 revision) which also requires the propectus includes the company ID number and the VAT number. As such it is a legal document.

Disclosure of names of directors
8.—(1) Where a company’s business letter includes the name of any director of that company, other than in the text or as a signatory, the letter must disclose the name of every director of that company.
(2) In paragraph (1), “name” has the following meanings—
(a)in the case of a director who is an individual, “name” has the meaning given in section 163(2) of the Act; and
(b)in the case of a director who is a body corporate or a firm that is a legal person under the law by which it is governed, “name” means corporate name or firm name.

Further particulars to appear in business letters, order forms and websites
7.—(1) Every company shall disclose the particulars set out in paragraph (2) on—
(a)its business letters;
(b)its order forms; and
(c)its websites.
(2) The particulars are—
(a)the part of the United Kingdom in which the company is registered;
(b)the company’s registered number;
(c)the address of the company’s registered office;
(d)in the case of a limited company exempt from the obligation to use the word “limited” as part of its registered name under section 30 of the Companies Act 1985(3) or article 40 of the Companies (Northern) Ireland Order 1986(4), the fact that it is a limited company;
(e)in the case of a community interest company which is not a public company, the fact that it is a limited company; and (f)in the case of an investment company within the meaning of section 833 of the Act, the fact that it is such a company.

HOW MANY SOURCES USED IN WIKIPEDIA CARRY A JAIL SENTENCE IF FORGED OR INCORRECT?

P. S. Removed reference to Sorrel Carson's illness as no source ref., is available. Simply named the directors  and official company titles without further comment.

http://www.opsi.gov.uk/si/si2008/draft/ukdsi_9780110806570_en_1