(1)The Authority shall not by virtue of anything in section 2 of the [1954 c. 32.] Atomic Energy Authority Act 1954 (general powers in relation to production, use and disposal of atomic energy and to carrying out research, etc.) have power to engage in any work, whether by way of research, experiment, development, production or otherwise, on any explosive nuclear device, whether for war-like applications or otherwise, except in accordance with arrangements made with the Secretary of State.
(2)In section 2(2) of the said Act of 1954, in paragraph (i) of the proviso (which precludes the Authority from developing or producing weapons otherwise than in accordance with such arrangements, but makes an exception for certain work on explosive nuclear assemblies) the words from " except that" to the end of the paragraph are hereby repealed.