Administrative Law - Natural JusticeNatural justice is relevant to admin law, though it was born within court-based law. It's hard to find a natural justice issue that does not have a counterpart issue under the heading of administrative 'fairness'. Generally though, natural justice is more advanced and fundamental than 'fairness'.
. McGregor v. Pitawanakwat
In McGregor v. Pitawanakwat (Ont CA, 2017) the court noted the useful point that a violation of natural justice in a hearing is appealable regardless of whether the violation influenced the outcome:
 A final preliminary point is that the denial of a fair hearing is a free-standing ground of review. A correct decision cannot cure an unfair hearing, because the unfairness would taint the entire proceedings: see R. v. S. (R.D.), 1997 CanLII 324 (SCC),  3 S.C.R. 484, at para. 100.. R v Olusoga
In R v Olusoga (Ont CA, 2019) the Court of Appeal reiterated the principle that a miscarriage of justice grounds an appeal even though no prejudice is shown:
 We agree with duty counsel that the appeal must be allowed and a new trial ordered. It is well-established that “a miscarriage of justice need not always be supported by the demonstration of actual prejudice to an appellant; sometimes, public confidence in the administration of justice is just as shaken by the appearance as by the fact of an unfair proceeding”: R. v. McDonald, 2018 ONCA 369 (CanLII), 360 C.C.C. (3d) 494, at para. 51 (quoting from R. v. Kankis, 2012 ONSC 378 (CanLII), 281 C.C.C. (3d) 113, at para. 37); see also R. v. Cameron (1991), 1991 CanLII 7182 (ON CA), 2 O.R. (3d) 633 (C.A.), at pp. 638-39; R. v. Morrissey (1995), 1995 CanLII 3498 (ON CA), 22 O.R. (3d) 514 (C.A.), at pp. 541-42.. Hearn v. McLeod Estate
In Hearn v. McLeod Estate (Ont CA, 2019) the Court of Appeal held that reliance on unadmitted evidence by the trial judge was a breach of natural justice:
 ... The first is a breach of the rules of natural justice. In Pfizer Co. v. Deputy Minister of National Revenue (Customs & Excise), 1975 CanLII 194 (SCC),  1 S.C.R. 456, the Tariff Board relied on two scientific publications that were not put into evidence or referred to at the hearing. The Supreme Court found this to be a breach of the rules of natural justice. Pigeon J. noted, at para. 18: “It is clearly contrary to those rules to rely on information obtained after the hearing was completed without disclosing it to the parties and giving them an opportunity to meet it.” He added at para. 19 that this was a “grave error”. In my view this principle applies to this case. See also Cronk v. Canadian General Insurance Co. (1995) 1995 CanLII 814 (ON CA), 25 O.R. (3d) 505, at paras. 24-26, per Lacourciere J.A.