Do customers care who runs a supermarket?

Justin King is one of the most respected retail figures in the UK, yet I suspect that many of the 18.5 million shoppers that use the stores have no idea who he is.

Sainsbury's chief executive Justin King is to leave the supermarket in July. Credit: Press Association

Unlike brands such as Virgin and Ryanair, the boss has not been used in television advertising. Yet the ultimate manager is vital - Sainsbury's says it's aim is to be the most trusted supermarket.

Trust takes constancy of leadership and direction - chopping and changing is soon seen in the sales isles. Mr King's last job at Sainsbury's will be one of his most important - creating a smooth handover.