A similar fate befell Barclays boss Martin Taylor, who headed a task force on welfare reform. A boardroom bust-up and the refusal of fellow directors to fall in with his plans for the bank led to Taylor's abrupt departure. As Davis mulls over his decision, he will be acutely aware that one of his predecessors at Sainsbury, David Sainsbury, was heavily involved with Government projects as the company's fortunes slumped.