17. Part 2 of these Regulations does not apply in relation to the carriage of class 7 goods by a vehicle or wagon belonging to, or under the responsibility of, one of the armed forces where those goods—
(a)are, or form part of, an instrument of war;
(b)are required for research into, or the development or production of, any such instrument or part of such instrument; or
(c)are produced in the course of, or in connection with, such research, development or production.