4. A person carrying out tuberculin testing must be—
(a)18 years of age or over,
(b)either—
(i)a trainee tuberculosis tester acting under the direct and continuous supervision of an authorised veterinary surgeon; or
(ii)an approved tuberculosis tester acting under the direction of an authorised veterinary surgeon, and
(c)in the case of a test carried out in –
(i)Great Britain, an officer of the Secretary of State; or
(ii)Northern Ireland, an officer of the Department.