"Were we right to order the respondent to pay the appellant's costs?"
"... the Chief Constable's responsibility is an onerous one. He has, of course, to act in good faith and he has to act reasonably and he must not misconceive the relevant provisions. But provided he acts in that way, it would be quite wrong for him to have to consider whether, if he did act in what he regarded as a proper fashion, costs might be awarded against him. That would be to inhibit his actions, which are there in the public interest."
"... generally speaking, a cost order adverse to such an authority would not be made unless there was some good reason for doing so, which was more than the fact that the other party to the contest had succeeded."
"We can understand why the ... Chief Constable might have taken the view he did."
"However, looking at the material before us, and indeed particularly bearing in mind what we now know happened in the Magistrates' Court when the appellant was in fact acquitted of both the allegations against him ..."
"... if it can be shown that the police's position has been totally unreasonable or prompted by some improper motive." And on the following page: " ... that the police have acted otherwise than in good faith or have acted utterly unreasonably before they are exposed to an order for costs."