I've been looking at this issue for the past couple of months, and the branch manual's data protection policies certainly seem at odds with British law on such things, especially so far as an implied consent for them to reveal highly private information to whoever they choose for all eternity is concerned. In Australia, it's probably worth noting that there is also evidence in the documentation handed over to the commission that the WBTS deliberately attempted to massage its accounts to avoid Australian data protection legislation applying to them.
Currently writing up a letter to the Information Commissioner's Office here in Britain. What may get more traction is a subject access request to WBTS here in London (not registered with the ICO) and seeing whether they provide the files requested. Intriguingly, IBSA is what is registered in Britain to handle data. My ability to subject access request them is severely limited by not having been through a JW judicial procedure nor done anything to generate a file at HQ.