Barclays Plc chief Antony Jenkins has threatened more cuts to its underperforming investment bank after a 750 million pounds ($1.2 billion) charge by the British bank provided fresh evidence of the costs of past misdemeanors by its traders. Barclays last year cut costs, improved its capital strength and shed unwanted assets, which Jenkins said justified his decision to accept his first bonus since taking charge three years ago - helping his pay for last year to more than treble to 5.5 million pounds. Barclays took a higher-than-expected 750 million pound charge in the fourth quarter as it prepares to settle allegations its traders manipulated foreign exchange markets. Barclays increased its provision for potential forex fines and settlements to 1.25 billion pounds and Jenkins said behavior had been "wholly unacceptable" and continued to cast a shadow on the bank.