Bona vacantia -- a quick query

Anyway, a somewhat perplexed friend of the IPKat has asked him if the Bona Vacantia Division automatically becomes the owner of registered trade marks where the owner has ceased to exist and has no successor. If so, is it possible to buy trade marks from the Division and how does one go about it. This Kat hasn't a clue and wonders whether any of his readers has any current or recent experiences of acquiring intellectual property rights from the Bona Vacantia Division that can be shared with readers of this blog. Please help if you can!
Merpel says, "And I thought bona vacantia" was the Latin for a nice holiday ...
Abandoned cats here