ROD Kent, chief executive of Close Brothers, is to step down in the autumn from the billion-pound City investment bank which is largely his creation. With the recent retirement of Brian Winterflood, whose market-making firm of the same name is one of Close Brothers's most successful investments, the bank will have lost three of its most high-profile figures within a few months. John Llewellyn-Lloyd, 42, head of corporate finance for six years, left at the end of December.