Investors have lost faith in how banks on this side of the Atlantic calculate and present risk weightings, according to analysts at Barclays Capital, in what they call "a deadly debate that European banks cannot afford to lose".

In a note this morning, BarCap analysts led by Simon Samuels, who ranked as the best analyst in the sector in the 2011 Thomson Reuters Extel rankings, asked how European banks can regain trust in risk weightings.