William driver Valtteri Bottas in action during day four of the final Formula 1 Winter Testing Bottas fastest on final testing day

Williams' Valtteri Bottas sets the pace as Mercedes emerge from the final day of pre-season testing as strong title favourites.

Watch video Rosberg has testing edge over Hamilton

BBC Sport's Lee McKenzie and Ben Edwards look back at the final day of testing in Barcelona as Nico Rosberg completes 148 laps at the Circuit de Catalunya.

Lewis Hamilton at the Brits Gossip: McLaren worried about reliability

Hamilton in talks with Jay-Z, access pass restrictions criticised, McLaren-Honda worried about reliability, plus more.

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