Thanks to everyone for their comments, after some assistance from the admins on the ebay sellers australia facebook group, (thank-you)  the issue was escalated to someone in sydney - I still do not have any clear understanding of exactly what the issue is or what additional information they need but for the moment the account is back in action, making sales and receiving payouts. It does seem that Trusts and Partnerships are the problem and as suggested many sellers with these structures have been left on the paypal system which hopefully will avoid issues for them until ebay get it sorted out.

It is astounding that with a great many businesses being set up as trusts and after well over a year of 'sprooking' managed payments to sellers ebay did not get their ducks in a row on this issue before launching but it is what appears to be the cause of the problem.

I assume at some point we will be contacted and asked for whatever additional information it is that they need but so far 'no news' appears to be 'good news'.  BTW OFT were not remotely interested - only advice they could offer was file a claim with small claims court for unpaid invoices.  It wasn't necessary in the end but I doubt it would have been worthwhile as there are no invoices sent from the seller to ebay and certified copes are required plus I have dealt with QCAT before and they are effectively powerless to do anything but send an official looking letter telling the debtor to pay - if they ignore it QCAT refer you to talk to a lawyer.