16. No charge may be made or recovered in respect of any services forming part of health services provided to a visitor who is any of the following—
(a)a member of Her Majesty’s United Kingdom forces;
(b)a Crown servant (other than a person falling within sub-paragraph (a)), recruited in the United Kingdom and employed by, or in the service of, the Government of the United Kingdom;
(c)an employee, recruited in the United Kingdom, of the British Council or the Commonwealth War Graves Commission;
(d)working in employment that is financed in part by the Government of the United Kingdom in accordance with arrangements with the Government of some other country or territory or a public body in such other country or territory.