UK's WPP falls after Diageo taps its executive Joanne Wilson as CFO
** Ad group WPP WPP.L shares down 1.2% at 384.5p
** Diageo appoints WPP's Joanne Wilson as CFO, succeeding Nik Jhangiani
** WPP WPP.L begins formal search for CFO successor; keeps 2026 outlook unchanged
** Wilson to join Diageo board and executive committee some time in 2027
** Shares of spirits maker Diageo DGE.L were flat after CFO appointment
** As of last close, WPP up 13.9% and DGE up 2.2%