"Accordingly the reality is that provided good reason appears, the court will then assess all the relevant considerations and make a balanced, a fact-specific judgement whether the specific authorisation should be granted. In other words, before the court makes an order under rules 90 to 92, a two-stage process is required; the first involves deciding whether there is "good reason" to make an order under rule 90(2) [sc. 90(3)], 91(1) or 92; if there is, then the second stage is to decide whether the requisite balancing exercise justifies the making of the order."