Consideration and conclusion
15The change in language, and the procedural history, of Tzaneros' pleading, are strong indications, at least in my mind, of the existence of a distinction between an allegation of defective construction, and an allegation of defective design. Such a distinction accords with common sense, and the plain English meaning of the words. Walker submitted that it never understood the relevant contentions in Tzaneros' pleading filed on 29 September 2010 as attributing blame for the defective design of the pavement works to Walker. I accept Walker's submission, and consider its position to be appropriate, especially given the procedural history of Tzaneros's pleading. I reject Tzaneros' submission that the proposed amendments are of little or no consequence to Walker. To the extent that Tzaneros' proposed amendments are seen as an attempt to revive a once "abandoned" claim (namely design defects), I should note that such conduct, though not best practice, is not, in the circumstances of this case, in violation of the prohibition against approbating and reprobating (Sydney Attractions Group Pty Ltd v Frederick Schulman (No 2) [2013] NSWSC 1153 at [8] and [35]-[44]).
16I accept the submissions of Tzaneros and Walker that it is not appropriate at this interlocutory stage of the proceedings to determine whether Walker's proportionate liability defence is good at law. I am firmly of the view that Walker's proportionate liability defence should not be struck out from its Construction List Response.
17I have also formed the view that it is not appropriate, at this stage of the proceedings, to determine whether or not AMT could have owed a duty of care to either P & O or Tzaneros. Contrary to AMT's submission, it is not clear, at least to me, that Tzaneros was not owed a duty of care by AMT. The authorities referred to in the submissions of both Tzaneros and AMT indicate that the question is far from clear, as it involves not just questions of law, but also questions of fact. Indeed, the level of analysis into which Tzaneros and AMT descended on this point in support of their respective positions, fortifies my view that the position is not as clear as AMT would have it. In a recent decision of the UK Supreme Court concerning the principles relating to non-delegable duty of care, Lady Hale (with whom Lords Clarke, Wilson and Toulson agreed) referred to the undesirability of stifling the development of the common law (Woodland v Essex County Council [2013] UKSC 66 at [28]).
18There is obviously an interest in having all issues between the parties ventilated once and for all; especially those which may not be capable of being agitated at a later stage, due to Anshun or other estoppels or principles. I do not understand the parties in this case to dispute that the expert reports recently obtained by Tzaneros legitimately raise the question of design defects in the pavement works.
19Against this, there are of course a number of countervailing considerations which must be taken into account. If Tzaneros is given leave to amend its pleading in the manner proposed, Walker will obviously suffer prejudice unless it is given leave to defray liability via a cross-claim (The Owners - SP 67635 v Metlej Developments Pty Ltd and others [2013] NSWSC 1564).
20Another factor which AMT submits is relevant to the exercise of my discretion, is that the amendments Tzaneros seeks are allegedly statute barred by s 14 of the Limitation Act 1969. The correctness of AMT's submission is doubtful (see s 64(3) and 65(2)(c) of the Civil Procedure Act 2005), as it is obviously arguable, and as I see it, almost certainly the case, that the design defect claims arise out of the same or substantially the same facts. Any amendment should therefore take effect from the date on which the proceedings were commenced.
21AMT also submits that Walker's cross-claim may be statute barred. However, as I have noted above, AMT accepts that s 74 of the Limitation Act 1969 has the effect that Walker's cross-claim is deemed to have been made in September 2009 (when proceedings were commenced), but says the court still has a discretion as to whether that section should take effect. I have taken into account (mainly below) the matters relevant to the exercise of that discretion.
22If Tzaneros' proposed amendments are permitted, and the filing of Walker's proposed cross-claim is permitted, the parties (or at least Walker and AMT) will almost certainly need to prepare and file further evidence. The delays involved in retaining further experts and preparing the evidence to finality, are obvious, and have been highlighted in the evidence filed by the parties for the purpose of the present motions. There has also been a joint expert regime, which I understand has been finalised.
23In the present case, no date has been fixed yet for the final hearing of this matter. Overall, I do not think that Tzaneros' proposed amendments and Walker's proposed cross-claim, if permitted, would result in prejudice of such a nature or of such a degree that would be incurable by an appropriate costs order.
24Taking these factors into account, I am prepared to grant leave to Tzaneros to amend its pleadings as sought in its motion filed on 26 July 2013, with effect from the date on which the proceedings commenced. Any costs thrown away (by Walker and AMT) as a result of Tzaneros' motion should be borne by Tzaneros.
25I am also prepared to grant leave to Walker to file a Cross-Summons and List Statement as referred to in its motion filed on 29 August 2013, with effect from the date on which AMT has been a party to these proceedings, which I understand to be the date of the commencement of these proceedings. I am satisfied that Walker filed its present motion in response to the belated amendment sought by Tzaneros to its own pleading. Any costs thrown away (by Walker and AMT) as a result of Walker's motion should be paid by Tzaneros.
26In arriving at these conclusions, and in forming a view as to the appropriate costs orders, I have borne in mind the principles expressed in Aon Risk Services Australia Ltd v Australian National University [2009] HCA 27; (2009) 239 CLR 175, and the firm comments recently made by the High Court in Expense Reduction Analysts Group Pty Ltd v Armstrong Strategic Management and Marketing Pty Ltd [2013] HCA 46 concerning the importance of parties giving effect to the aims of, and carrying out the duties imposed by, ss 56-59 of the Civil Procedure Act 2005.
27I invite the parties to prepare short minutes of order giving effect to my reasons, including an order re-listing the matter in the Commercial List, at a time suitable to the parties, for directions.