New Williams breaks cover as testing resumes in Barcelona

The new Williams FW35 was revealed today, the last of the 2013 cars to break cover. The team opted to test at Jerez with the 2012 model to give more time for development of the FW35 and to get a baseline understanding on the new Pirelli tyres, using a car they know and understand.

It's not ideal to lose a four day test session with the new car, when there are only eight more days testing before the first Grand Prix in Melbourne, but Williams has gone this route - the only team to do so - and will hope for a reliable run through the two final tests, with its drivers Pastor Maldonado and Valtteri Bottas.

It should allow them to put up around 3,500 kilometres on the car before the opening race.

An evolution of the 2012 car, which won the Spanish Grand Prix, the FW35 has a new gearbox, new rear suspension, new radiators and new floor, exhaust layout and nose.

Continuity is always important in F1, but Williams as a team has undergone significant changes since the end of last season, with the loss of two management figures; Mark Gillan on the race operations side, with most of his responsibilities passing to Xavi Pujolar, while Toto Wolff's departure to Mercedes has left a hole on the team management side, which Williams will urgently need to fill.

The Williams was revealed with a new sponsor in Experian, another new brand to enter F1.