22A pension payable by a Secretary of State under or by virtue of any of the following:—
(a)section 6 of the [1946 c. 81.] National Health Service Act 1946 or of the [1947 c. 27.] National Health Service (Scotland) Act 1947 (former officers of voluntary hospitals) ;
(b)section 67 or 68 of the National Health Service Act 1946 or section 66 or 67 of the National Health Service (Scotland) Act 1947 (former officers of hospital authorities and others engaged in health services).