Advertising agency WPP is up following encouraging news from French rival Publicis, which reported that advertising demand improved in October.In a trading update Publicis Groupe's Chief Executive and Chairman, Maurice Levy said: "After the brutal and unexpected decline of advertising spendings in September the Publicis Groupe's organic growth of October revenues is above 7%. This spectacular growth is driven by the US, fast growing markets and digital numbers."The read across for Martin Sorrell's WPP has been taken as positive and the shares are up 14p at 822p at 10:43.CM