Valtteri Bottas signed off the 2015 pre-season in style by going fastest for Williams on the final day of testing at Barcelona on Sunday.

The Finn hit the front early and was never deposed, as a qualifying simulation on Pirelli’s supersoft tyre yielded a 1m 23.063s – which left him almost half a second clear of the chasing pack via Formula1.com – Latest News http://ift.tt/1FKG0ob