It can be easy to forget that former Barclays chief executive Bob Diamond was not always "the unacceptable face of banking”.

In 2007, the best year on record for global investment banking revenues, according to Dealogic, Diamond topped the FN100 list of the most influential people of European capital markets. At the time, FN pointed to the accelerated growth of Barclays fuelled by bumper profits at Barclays Capital, the investment banking division Diamond ran at the time.