Background Stories, page-590

Link won't really be of any help as the holding will now be Issuer Sponsored.

A financial adviser can't help you with claiming a loss, unless they are organising the private arrangement for sale of shares. Aside from that, there are really only 2 possibilities from here:
1. There is some sort of corporate action - e.g. they get finance, pay the listing fees and are reinstated; there is a takeover offer of some sort; they sell off the assets to a competitor; etc... In this case the shares might have some value.
2. None of the above happens, an administrator/liquidator is appointed and you will only be able to claim a loss once the administrator releases a written declaration that there is no value in the shares. In my experience this will take maybe a year or two, and will only happen after the administrator has bled the company dry of any available funds. If anyone else receives funds it will be secured creditors, not shareholders. Sometimes the declaration is only provided several years after delisting.