Tractor test: Valtra S280 While Valtra has built a substantial UK following in the mid-sized tractor class the Finnish maker is struggling to make a similar impact with its twinmodel flagship range the S-series in a 230-300hp sector that continues to be dominated by the likes of Deere and Case IH. Is it down to hardware? We put the 206kW/280hp Valtra S280 through our test