Just and suitable in specific circumstances
The following passage from the speech of Lord Chancellor in Local Government Board v. Arlidge  A.C. 120 is apposite and instructive.
“My Lords, I concur in this view of the position of an administrative body to which the decision of a question in dispute between parties has been entrusted. The result of its enquiry must, as I have said, be taken, in the absence of directions in the statute to the contrary, to be intended to be reached by its ordinary procedure. In the case of the Local Government Board it is not doubtful what this procedure is. The Minister at the head of the Board is directly responsible to Parliament like other Ministers. He is responsible not only for what he himself does but for all that is done in his department. The volume of work entrusted to him is very great and he cannot do the great bulk of it himself. He is expected to obtain his materials vicariously through his officials, and he has discharged his duty if he sees that they obtain these materials for him properly. To try to extend his duty beyond this and to insist that he and other members of the Board should do everything personally would be to impair his efficiency. Unlike a Judge in a Court he is not only at liberty but is compelled to rely on the assistance of his staff”.