21.—(1) The power of the Lord Chancellor under regulation 20 to reject a selection at stage 1 or 2 is exercisable only on the ground that, in the Lord Chancellor’s opinion, the person selected is not suitable for the office concerned.
(2) The power of the Lord Chancellor under regulation 20 to require the selection commission to reconsider a selection at stage 1 or 2 is exercisable only on the grounds that, in the Lord Chancellor’s opinion—
(a)there is not enough evidence that the person is suitable for the office concerned;
(b)there is evidence that the person is not the best candidate on merit; or
(c)there is not enough evidence that if the person were appointed the judges of the Supreme Court would between them have knowledge of, and experience of practice in, the law of each part of the United Kingdom.
(3) The Lord Chancellor must give the selection commission reasons in writing for rejecting or requiring reconsideration of a selection.