Analysis
15 In my judgment, the question of necessity posed by Part 8 r 8(1)(b) is to be assessed having regard to the practicalities of the particular matter. In some cases, it may be the case that a legal right can be shown to be affected: and if this is so, then ordinarily, joinder will be "necessary" for the purposes specified in the paragraph. However, consideration of the application of the paragraph must also accept that the necessity that it invokes differs from, and is presumably a less stringent requirement than, the concept of necessity invoked by paragraph (a).
16 I should specify the precise nature of the injunctive relief that Gordian, by its amended summons, seeks against Phillips Fox:
"1 An Order that the defendants, by themselves or by their servants or agents be restrained from further acting against Gordian Runoff Limited in Supreme Court of New South Wales, Equity Division, Commercial List, proceedings 50176 of 2003.
2 An Order that the defendants, by themselves or by their servants or agents be restrained from advising any of the following parties (whether directly or indirectly, including by the provision of advice or legal professional services to any solicitor retained by any such party):
(a) Baulderstone Hornibrook Engineering Pty Limited or any related companies; or
(b) any of the parties to proceedings 55027 of 2002 in the Supreme Court of New South Wales, Equity Division, Technology and Construction List or any related companies; or
(c) any of the parties to proceedings 6115 of 2001 in the Supreme Court of New South Wales, Equity Division or any related companies,
in relation to proceedings against Gordian Runoff Limited in Supreme Court of New South Wales, Equity Division, Commercial List, proceedings 50176 of 2003 or the subject matter of them."
17 So far as BHE is concerned, an order in terms of prayer 2 would have the practical effect that Phillips Fox could not provide advice or assistance to BHE or Freehills in relation to any issue arising in the indemnity proceedings.
18 One fundamental issue in the indemnity proceedings will be whether BHE had any liability to SACL in respect of the design and construction of the third runway. Another fundamental issue will be whether BHE is entitled to be indemnified by the defendant insurers (including Gordian) in respect of any such liability. Clearly, in dealing with those questions in the context of the indemnity proceedings, BHE's solicitors will require a very detailed knowledge of the facts, issues and evidence that are (or would have been) relevant in the SACL proceedings. Clearly, much of that knowledge presently resides in Phillips Fox and, in particular, in Mr Price. The practical effect of an order in terms of prayer 2 would be to deny BHE and Freehills continuing access to that knowledge.
19 In a real and practical sense, I think that BHE's prosecution of the indemnity proceedings would be very seriously hampered if it did not have continuing access to the knowledge, relating to the SACL proceedings, residing in Phillip Fox. In my judgment, that provides a sufficient basis for the conclusion that the orders sought in the Phillips Fox proceedings might directly affect the rights of BHE.
20 Phillips Fox advanced, as a basis for supporting BHE's application to be joined as a defendant, that there would then be an effective contradictor. Phillips Fox submitted that its ability to defend the proceedings against it, in the absence of BHE, might be hindered because of questions of privilege and confidentiality as between itself and BHE.
21 The situation is not as clear as it was in Great Eastern Cleaning, where (if the Commissioner were not joined) there would be no effective contradictor but where the making of the order sought could have a direct impact on the rights of the Commissioner in other proceedings. Needham J considered the absence of an effective contradictor to be a circumstance relevant to the exercise of discretion in favour of the Commissioner. In the present case, it is going too far to say that, absent BHE, there would be no effective contradictor. Nonetheless, if BHE were joined, any difficulties of the kind adverted to would be minimised; and Phillips Fox might, perhaps, be able to take a less active role (in effect, leaving it to Gordian and BHE to argue the matters in dispute). I do think that this is a circumstance that is relevant to, although not dispositive of, the exercise of discretion.