I know this is an old string but to bring it up to date for those researching diving Leander Class Wrecks in New Zealand or HMS Scylla (Plymouth, UK) or HMAS Swan (WA).
I am a Tec Diver specialising in Tec Sidemount Diving but also served for 14 years in the Royal New Zealand Navy as an Engineer Officer, six of these on Leanders, HMNZS Canterbury and Wellington. I was the MEO (Chief Engineer) on Canterbury in 1992 and obviously know this class and the wrecks well.
I have recently released the book, "The Canterbury Wreck: A Diver's Guide". The book is a complete reference to diving the Canterbury wreck. It describes the ship in detail, its history, the various decks and compartments, what they were used for, how the crew lived, the current state of compartments as seen by a diver and some ideas on routes and plans for diving the ship. The book includes numerous images and diagrams showing the ship, its layout and dive routes.
It is available at selected dive stores and centres in New Zealand and also via Amazon at - https://goo.gl/8BqX2j
I'd also be more than happy to answer any questions on this forum regarding diving the Leander wrecks or the ships.
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