The purpose of the thread is to identify how to close the 22bn deficit, not to re engineer society according to your grand vision.
I believe a retrospective tax would increase rather than decrease the deficit for the reasons I outlined, do you have a response to that?
So what? Let's call it a retrospective tax. I'm saying it could be structured in a way that takes some account of ability to pay, eg. by accounting for capital losses since then. And it would be once-off, to help pay for the present catastrophe in an equitable fashion. CGT should be upped closer to marginal income tax rates going forward, so there would be no need for it in the future.