Based on this Scottish Sun article https://www.thescottishsun.co.uk/sport/football/4955264/rangers-hmrc-tax-case-ebt-expert/ I suspect the BDO June statement that the tax bill had reduced to £83M has now been superseded and is actually £24M lower than that, once Hector waives the £24M penalty. Interest will also come down a bit.
I'm guessing (I know, I know) that the £83M is now closer to £50M. Still enough to make them unsellable in 2011.