Catchwords:

PRACTICE AND PROCEDURE – joinder – appeal against refusal of application to modify development consent – parties agree on terms of a decision to dispose of appeal – intervenor raising jurisdictional issue that court has no power to so dispose of the appeal – source of power to join intervenor – whether s 8.15(2) Environmental Planning and Assessment Act available power for joinder – section 8.15(2) not an available power of joinder for this appeal – whether r 6.24 Uniform Civil Procedure Rules alternative source of power for joinder – whether joinder as a party necessary to determine all matters in dispute – whether power to amend modification application – whether error in exercise of discretion to join intervenor – whether joinder legally unreasonable