Patience, my dear Brynley, patience. R.B.S. is not being sold, today. That bank is in the process of recovery and the government will receive it's money back. But, not today.
As for your second paragraph, I have to confess that I am somewhat bemused by your "logic". Please can you explain how the preventing of R.B.S. from failing also saved the likes of Barclays and H.S.B.C.? I was not aware that they were part of the R.B.S. group. If H.S.B.C. was in trouble, I would be worried about my pension. As it is, the bank injected £1.76billion into the scheme last June and further injections totalling £1.75billion are scheduled in tranches up to 2018. If the bank was so reliant on the survival of R.B.S., I wonder how it was able to commit itself to that level of outgoing.