The shares were all cancelled upon nationalisation as I understand it. Your shares (and mine) unfortunatly no longer exist. There is now effectively only one share. The bank would have to issue new shares which a consortium would then buy for, say, $5bn, as sum which then has effectively gone in as capital.
But the only way I see this working is if the government agreed to share the first portion of losses, or put in place some kind of limited loss guarantee. In which case, the government should just keep the bank, so it can use it for its own ends - it will likely be on the hook for some amount of losses either way. Personally I dont think a sale to private equity right now will be a runner, nor will be best for the country.
I think a large part of the public will misunderstand this transaction as well, and will be angry that the $5bn that a buyer might spend wasnt paid to the previous Anglo shareholders. But this isnt how it would have worked had someone bought anglo before nationalisation. A buyer would have paid only a cent or two, if anything, per share, and put in $5bn capital after the purchase. The bank was effectively insolvent and not worth anything - shareholders would have got nothing, or practically nothing, even if there had been a willing buyer of the bank before the government stepped in.