Consideration of the construction arguments
45 There is authority that the obligation of disclosure may be altered by an insurer limiting its right to be informed of the insured's knowledge, not only as to the existence of facts but also as to their materiality: Jones v Provincial Insurance Co (1857) 3 CBNS 65 at 86; 140 ER 662 at 671; Southern Cross Assurance Co Ltd v Australian Provincial Assurance Assn Ltd (1939) 39 SR (NSW) 174 at 187-188; 56 WN (NSW) 77 per Jordan CJ and Nicholas J; National General Insurance Co Ltd v Chick (1984) 3 ANZ Ins Cas 60-579. That said, each of those cases tends to turn on the insurer's pre-contractual actions in posing questions, the answers to which will form the basis of the policy. It is one thing for an insurer to accept the risk of being uninformed by the manner in which pre-contractual questions are posed to a prospective insured, but there are entirely different considerations when the insurer has been prepared to enter into the policy on the assumption that the statutory disclosure obligations have been fulfilled. Here, there is no suggestion that prior to entering into the contract there was any agreed alteration to the insured's obligation of disclosure and nothing to suggest that the insurer offered the policy terms to the Applicants otherwise than on the basis that they had complied with their disclosure obligations.
46 The difficulty with the Applicants' principal submission is that it relies upon an implication which negatives a fundamental element of the agreement between the parties. As against the serious duty of full material disclosure what is relied on is an oblique implication made by part of a single term which is primarily directed at other matters. The argument is not that one term of the policy should be read down so as to give the Advancement Extension its full and complete operation. It is that the Extension should be read as an agreement by the insurer to forgo, or to temporarily forbear from, exercising its statutory rights concerning the contract, some of the rights being concerned with fraud. In this light the argument encounters significant difficulties.
47 The terms of a policy of insurance are usually agreed to by the insurer on the common understanding of the insured's having performed an obligation to disclose to it all relevant facts which are or ought to be reasonably known to it which are relevant to the risk insured. In Permanent Trustee Australia Limited v FAI General Insurance Company Limited (in liq) (2003) 214 CLR 514 at 542 [67], Gummow and Hayne JJ recognised that prior to the ICA it had been accepted that insurance was a contract on a speculation and that the special facts on which the contingent chance is to be computed are most commonly within the knowledge of the insured only. That required the underwriter to trust representations made by the insured and the insured not to keep "back any circumstance in his knowledge, to mislead the under-writer into a belief that the circumstance does not exist, and to induce him to estimate the risque, as if it did not exist": Carter v Boehm (1776) 3 Burr 1905 at 1909; 97 ER 1162 at 1164. The duty was one at common law, upon compliance of which the contract was founded; it was not a term or obligation of the contract.
48 Whilst s 21 of the ICA replaced the common law duty of disclosure in terms of the extent of the insured's obligations: Advance (NSW) Insurance Agencies Pty Ltd v Matthews (1989) 166 CLR 606, 615: the underlying rationale for pre-contractual disclosure remains. Also, it remains properly conceptualised as separate from (though obviously related to) the contract of insurance. The importance of the duty under the ICA is emphasised by the remedies available to the insurer under s 28 for failure by an insured to comply with it. In particular, an insurer's entitlement to reduce its liability to the extent to which it has been prejudiced by the non-disclosure manifests the direct link between the obligation and the terms and conditions on which the insurer is prepared to underwrite the risk or, indeed whether it is prepared to do so at all. If it can show that, had it been informed of the facts relevant to the risk which has crystallised, it would not have entered into the policy or would have included an exclusion in relation to such circumstances, it is entitled to reduce its liability to nil: Alexander Stenhouse Ltd v Austcam Investments Pty Ltd (1993) 67 ALJR 421; Advance (NSW) Insurance Agencies Pty Ltd v Matthews. The duty of disclosure has always been and remains the essence of the insured's obligation of utmost good faith: Derrington D and Ashton R, The Law of Liability Insurance (3rd ed, LexisNexis, 2013) at [4-48] [4-49]: and the argument that this essential obligation ought not be displaced by an implication from words of general import or that its displacement required a degree of clarity has more than substantial respectability.
49 The significance of the insured's obligation of disclosure to the formation of the contract of insurance and the terms on which the underwriter might assume the risk, inform the manner in which the Advancement Extension might be construed in the present case. We see no basis to conclude that the cover provided by the Advancement Extension was granted to the insured on the basis other than that the insured had complied with the duty of disclosure.
50 As has been indicated, the Applicants argue that, regardless of any breach of their obligation of disclosure, they remain entitled to rely upon the insurer's obligation to provide cover which it agreed to on the faith of the fulfilment of that obligation. That proposition is unusual as it inverts the ordinary process of the formation of contracts of insurance, and would result in an insurer being required to cover a claim which the insured ought to have disclosed prior to the entry into the contract and which, had it been disclosed in the ordinary course, would likely have been specifically excluded. The purpose of disclosure is to permit the insurer to be as fully informed of the risk as the would-be insured's special knowledge would provide so that it may introduce suitable limitations on the cover which it is willing to provide. It is not uncommon for a disclosed risk to be specifically excluded. In the present case, there is no basis to believe that the insurer would have agreed to cover the disputed risk if it had been fully informed of its details, and it is stretching the principles of implication to imply, from the indirect terms of the limitation on refusal to advance costs, a promise that the insurer would cover a risk which had been wrongly undisclosed.
51 The manner in which limitations on an insurer's entitlement to refuse to advance defence costs operate is discussed with some particularity in Derrington and Ashton at [8-583], which contains the following:
There are other variations of the terms on which the obligation to advance these funds may be engaged and the insurer's liability in this respect is sometimes affected by the policy's language. For example, it may be that it may not refuse to do so by reason only that it considers that the insured's conduct referred to in a particular exclusion has occurred, until such time as there is an admission by the insured, or, a judgment, award or other finding by a court, tribunal or arbitrator with jurisdiction to finally determine the matter (including the outcome of any appeal in relation to such judgment, award or other finding) which establishes the foregoing. At the same time, it may provide that the obligation does not engage if the insurer denies liability to provide indemnity. This complication is resolved by a construction which permits the insurer to refuse to advance costs if it is entitled to deny liability on any ground other than the exclusion which requires admission or adjudication. The inapplicability of one exclusion as a valid ground for the insurer's denial would not defeat the application of another ground which is available. There has been some difference of opinion as to whether it would be incongruous for an insurer to be liable to indemnify for defence costs of a claim in respect of which liability for the loss claimed was excluded: McCarthy & Ors v St Paul International Insurance Co Ltd [2007] FCAFC 28; Major Engineering Pty Ltd v CGU Insurance Ltd (2002) 238 ALR 363 at [41]-[42]. Contra: Silbermann v CGU Insurance Ltd [2003] NSWCA 203; (2003) 57 NSWLR 469 at [70]-[77] and on appeal to the High Court of Australia in that case in Rich v CGU Insurance Ltd [2005] HCA 16; (2005) 214 ALR 370 at [11]. But this factor, while having an influence on the construction of the Advance of Costs provision, cannot prevail over its clear terms. It is true that a denial of indemnity under the provision may be based on matters which have nothing to do with any exclusion under the list of Exclusions. Also, it may not be said that the insurer's power to deny indemnity for the purposes of the provision necessarily extends to all of the bases of exclusion under that list. But it may be clear that although its extension to the specified Exclusion is subject to the requirement that the application of that exclusion is established, there may be nothing in the text of the provision which suggests that the relevant right to deny is not intended to extend to other exclusions. Any absence of any reference to Defence Costs in the opening words of the list of exclusions is not to the point: BOQ Ltd v Chartis Aust Insurance Ltd [2012] QSC 319.
On the other hand, if an exclusion which is invoked by the insurer requires proof for its engagement, it cannot rely on it to refuse to make the advance, but it can do so if the exclusion is engaged, or if there is another operative ground for refusal, such as avoidance: Intergraph (supra); Wilkie v Gordian Runoff Ltd [2005] HCA 17; Rich v CGU Insce Ltd; Silbermann v CGU Ltd [2005] HCA 16. If it relies on a qualification as to its obligation to advance costs, and the qualification depends on the existence of circumstances which are described in the provision as 'determined', 'in fact' or 'finally adjudicated', there is considerable disagreement as to when and how this is fulfilled, but it is clear that much depends on the language used, including comparison with other terminology of the same genus in the policy that will suggest exclusion of a construction by reason of the variation of usage. The parties may agree as they wish, as manifested by the words of their agreement, so that no rule can be stated that may not be overridden by the terms. Still, some general forms of reasoning may be observed. If a provision's operation is qualified by the preface, 'If the court finds …', it is an issue of fact as to whether the insured was a party to the conduct: Coral Reef Prods v Axis Supply Insce Co 2012 Mich App LEXIS 1149. If an exclusion refers to the conduct or state of affairs 'in fact', whether the insurer may rely upon the nature of the claim that is made before judgment is given against the insured may depend on the nature of the claim and his intended action: Brown & Laconte LLP v Westport Insce Corpn (supra). The expression does not necessarily require final adjudication by the underlying fact-finder, but does require evidence upon which the fact may be determined in the relevant proceedings: Westport Insce Corpn v Hanft & Knight PC 2007 US Dist LEXIS 90599.
52 As can be seen from that passage, the extent of any limitation on an insurer arising from an agreement to advance defence costs, will be limited to the obligations contained in the extension and by its terms. Consistently with established principle, a limitation on the ability to refuse to advance defence costs contained in an Extension will not usually be taken to limit the insurer's entitlement to decline indemnity on other grounds save where that is expressly agreed.
53 None of the above should be taken as denying that there may be circumstances in which an insurer may be found to have agreed to provide cover for risks which in breach of the obligation have not been disclosed. However, that unusual construction would need support by clear words rather than words of dubious effect: Duncombe v Porter (1953) 90 CLR 295, 311. Here, there are no such clear words in the Extension limiting the insurer's rights consequent upon the insured's non-disclosure.
54 Further, the process of construction advanced by the Applicants fails to construe the policy as a whole. Their construction would make it necessary to conclude that the insurer has agreed to temporary non-reliance on its rights under s 28 consequent upon the insured's non-disclosure. This is not consistent with the actual terms of the policy. Both by the policy's schedule and general terms/conditions section, the Management Liability and Professional Indemnity cover is issued in a "claims made and notified" form. It is explained that the cover applies to claims, as defined, provided that the insured was not aware at any time prior to the policy inception of circumstances which would have put a reasonable person in their position on notice that a claim might be made. Additionally, the exclusion for "Known Claims and Circumstances" is a strong indication that the insurer would not provide cover in respect of claims where the underlying circumstances were known to the insured prior to the policy's inception. The Retroactive Date applicable to Messrs Onley and Cranston of 1 June 2016, fortifies the above conclusion.