“…certain principles can be distilled from the authorities to which I have referred … Those principles can be expressed in this way, that a court is only likely to find a breach or an intended breach ofs123(2) of the Local Government Act 1972 if the council has (a) failed to take proper advice or (b) failed to follow proper advice for reasons which cannot be justified or (c), although following proper advice, followed advice which was so plainly erroneous that in accepting it the council must have known, or at least ought to have known, that it was acting unreasonably.”
“24 …it is also important to bear in mind, as the defendant has submitted before me, that, first, provided that which it is legally relevant for the decision maker to know is brought to its attention, it is generally for the decision maker to decide upon the manner and intensity of the inquiry to be undertaken into any relevant factor (see R (on the application of Bevan & Clarke LLP and Ors) v Neath Port Talbot Borough Council[2012] EWHC 236 (Admin) , at paragraph 56 (Beatson J)). “25 Secondly, the weight to be given to a relevant factor is for the decision maker and not for the court in the absence of irrationality (see the same case at paragraph 57). I would add this observation, again accepting the defendant's submission on this point. It will frequently be the case and is undoubtedly the case in the present context, that the relevant factors to which the decision maker must have regard do not all point in the same direction. They may well pull in different directions and a balance will have to be struck. This is quintessentially a function of the public authority concerned, subject always to judicial review on the ground of irrationality. …”
“15… The courts should not permit, except for good reason, proceedings for judicial review to proceed if a significant part of the issues between the parties could be resolved outside the litigation process.”