Before deciding an application for approval of the exercise of powers under an emergency authorisation given under section 343 , the judge must, in particular, and being mindful of the highly intrusive nature of using a surveillance device, consider the following—
(a) the nature of the risk of serious violence to a person or substantial damage to property;
(b) the extent to which issuing a surveillance device warrant would have helped reduce or avoid the risk;
(c) the extent to which law enforcement officers could have used alternative methods of investigation to help reduce or avoid the risk;
(d) how much the use of alternative methods of investigation could have helped reduce or avoid the risk;
(e) how much the use of alternative methods of investigation would have prejudiced the safety of the person or property because of delay or for another reason;
(f) whether or not it was practicable in the circumstances to apply for a surveillance device warrant;
(g) any submissions made by a monitor.