“I agree with the opinion of Clarke J [the Judge at first instance] that the tort can be constituted by an omission by a public officer as well as by acts on his part…… but whether the public officer is sued in respect of an act or omission, it must be a deliberate one involving an actual decision and liability will not arise from injury suffered by mere inadvertence or oversight. I also agree with the opinion of Clarke J.... that it is sufficient for the plaintiff to prove that the public officer foresaw that his action would probably injure the plaintiff; to require foresight of certainty of harm would be unrealistic and, being very difficult to prove, would give inadequate protection against abuse of power. I further consider that if the public officer knows that his unlawful conduct will probably injure another person or is reckless as to that consequence, the plaintiff does not need to show, before liability can arise, some other link or relationship between him and the officer.”