R (o.t.a. Oakley) v. South Cambridgeshire District Council  EWCA Civ 71, 15 February 2017, read judgment
There is, I am glad to say, an insistence these days in the Court of Appeal that the giving of proper reasons is a necessary part of what can be expected of a planning authority when it grants permission: see my post here for a case last year.
And the current case is another good example. The CA, reversing Jay J, decided that the planning authority had acted unlawfully in not giving reasons in this case.