Per White JA (Brereton JA and Barrett AJA agreeing at [182] and [183] respectively)
As to issue (i)
The right to suspend works arises were there has been a failure to pay a "scheduled amount". The definition of "scheduled amount" does not include interest payable under s 11 on the unpaid amount of a progress payment unless that amount is included in a "scheduled amount": [53], [63], [68], [69].
Building and Construction Industry Security for Payment Act 1999 (NSW), applied. Taylor v The Owners - Strata Plan No 11564 (2014) 253 CLR 531; Wentworth Securities Ltd v Jones [1980] AC 74, referred to.
As to issue (ii)
Due to the resolution of issue (i) in favour of the respondent the appellant was in breach by wrongly suspending its construction of works: [106], [107].
No error was shown in the primary judge's conclusion that the appellant was also in breach throughout the relevant period due to the failure of the appellant to achieve Practical Completion under the contract: [109], [117], [122], [126], [127], [132], [133], [139], [140].
As to issue (iii)
The involvement of the respondent in issuing the 'show cause notice' did not invalidate the notice as RCP was satisfied that the notice should be issued and was satisfied with the grounds for the giving of the notice as stated in it: [79], [80]. It would be inconsistent with the respondent's rights under the contract and its right to see that its representative acts properly if it could not be involved in RCP's decision: [97].
RCP did not need to exercise its judgment independently of the Principal where RCP was genuinely satisfied with the notice as drafted by the respondent: [91].
As to issue (iv)
RCP did give adequate and proper consideration to issuing the 'take out notice' as the evidence that RCP's officer reviewed and discussed the appellant's response to the 'show cause notice' was not successfully challenged: [157], [158].
There was no prejudgement or lack of consideration by RCP of the appellant's response to the show cause notice or the factual circumstances in reaching the required level of satisfaction for the respondent to issue the 'take out notice': [159], [162], [163].
As to issue (v)
The 'without prejudice' privilege is not based upon an implied agreement that if the negotiations do not result in an agreement for settlement of the dispute, the parties will make no use of what has been disclosed by the other party in the negotiations: [167], [172], [173], [175], [176]
Pihiga Pty Ltd v Roche [2011] FCA 240; (2011) 278 ALR 209; Unilever plc v The Proctor & Gamble Co [2001] 1 All ER 783; Cutts v Heads [1984] CH 290, referred to.
As to issue (vi)
This argument was dealt with in detail by the primary judge and no error was shown as to the primary judge's disposition of the argument in favour of the respondent: [179], [180].