But whether the cumulative impact of its market rigging was more or less great than UBS's is - I am told - still undetermined.

BBC: Heads may roll at RBS over Libor

First, I am not surprised that the size of the loss has turned out to be 15% greater than UBS first estimated - because selling or hedging big trading positions in a hurry, as UBS had to do on Friday, is always expensive.

BBC: The how but not why of UBS's losing bets