Welcome to live coverage of the opening practice for the Spanish Grand Prix in Barcelona.

Thanks for joining us for coverage of the opening session - come back at 1pm (UK time) for FP2!

The report.

Perez finally set a time for McLaren late on, but Button did not manage it...

Alonso finishes top of the order with 1m25.252s.

The top spots are changing all the time as the session winds down. All the drivers out there pushing.

Raikkonen second... and Massa goes top with his next lap of 1m25.618s!

Massa off at turn seven! He lost control briefly and couldn't rectify it before heading into the gravel trap.

And now Bottas leads the way with a 1m26.456s.

He isn't there long - Alonso now top with a 1m26.804s.

Bottas goes second with Di Resta now third. And Hamilton takes over top spot with a 1m26.918s. The times falling rapidly.

Maldonado third. Ricciardo improves to 1m27.904s at the top.

Rosberg goes second with 1m30.333 while Vettel is now out for a final run in the session.

Ricciardo with a far quicker 1m29.602s.

Vergne back in after running off track on a hot lap.

Massa now just two-tenths off Vergne's pace.

Massa runs wide but guides the Ferrari back on to the circuit at the final turn.

Vergne on dry tyres - and it shows! His time of 1m34.710s puts him almost two seconds clear.

Massa leading the way now with 1m36.005s.

@InsideFerrai: A little more than 20 minutes to the end..for the moment its still not possible to switch to dry tyres..maybe someone will be brave enough..

Hamilton goes from 10th to fourth then top! No messing about from the Briton... 1m36.159s his time.