The Air Navigation Order 1995

(7) The aircraft shall not carry any cargo, or any persons other than the flight crew except the following:

(a) persons employedby the operator who during the flight carry out duties or are tested or receive training in connection with a purpose specified in paragraph (2);

(b) persons acting on behalf of the manufacturers of component parts of the aircraft (including its engines) or of equipment installed in or carried in the aircraft for carrying out during the flight duties in connection with a purpose so specified;

(c) persons approved by the Authority under article 122 of this Order as qualified to furnish reports for the purposes of article 9 of this Order;

(d) persons other than those carried under the preceding provisions of this sub-paragraph who are carried in the aircraft in order to carry out a technical evaluation of the aircraft or its operation;

(e) cargo which comprises equipment carried in connection with a purpose specified in sub-paragaph (2)(f); or

(f) persons employed by the operator or persons acting on behalf of the manufacturers of component parts of the aircraft (including its engines) or of equipment installed in or carried in the aircraft in connection with the purpose specified in sub-paragraph (2)(f) which persons have duties in connection with that purpose.