The Guardian Media Group chief executive, Carolyn McCall, is standing down from the board of Lloyds Banking Group in December.
McCall has been chief executive of GMG, publisher of MediaGuardian.co.uk, since July 2006, and joined the board of Lloyds in October 2008.
"Since my appointment to the board in October 2008, the level of time commitment properly required of a non-executive director in the banking sector has increased dramatically. The global banking crisis and the recent Walker report have thrown this issue into sharp relief," she said.
"I have therefore decided, with regret, that the responsibilities of being a chief executive make it impossible to dedicate the time that I know is required to Lloyds. I wish the bank and its board every success in the future."
Sir Win Bischoff, the chairman of Lloyds Banking Group, added: "We very much appreciate the contribution Carolyn has made to the board during challenging times for the banking sector and, while I understand her decision, we shall miss her constructive involvement."
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