Havas has warned its planned restructuring will cost e180m although it is expected to bring savings of e90m in a full year. It is also forecast to have a positive effect of e110m on its cash in 2004. The company said that, having put the plan in place, its priority would be to refinance convertible-bonds due in 2006. Havas shares fell sharply in Paris. WPP boss Sir Martin Sorrell has been brutally honest about the outlook for advertising during the past couple of years, so investors sat up and took notice when he recently came out with some optimistic comments.