Ferrari were fastest on the final day of the first week of testing

The Formula 1 teams are halfway through their pre-season programmes following this week's test in Spain and it is just becoming possible to view shapes of the year to come.

The 2017 season heralds a revolutionary change to the cars, following rule changes aimed at making them deliberately faster for the first time in decades.

The drivers have been revelling in the higher cornering speeds and greater demands on their skills over four days at the Circuit de Barcelona-Catalunya this week.

And while trying to interpret form from testing is always fraught with risk, a sense of the competitive order is beginning to emerge, with promising signs for some famous names, and worrying ones for others.

The new cars

Lewis Hamiltonproblems, first with an oil-tank problem on Monday and then an engine failure on Tuesday.

McLaren were slow. Too slow for Fernando Alonso, who was not happy

That was four engines used in two days. And although Honda has not been completely clear how many engines were used in total, it was at least five in four days.

The car ran more reliably over the final two days of the test but it was slow, although exactly how slow was hard to judge given Honda said the engine was not being run in its final specification.

The problems are clearly not all to do with Honda but a large part of them are - McLaren were slowest through the speed traps on the start-finish straight.

Fernando Alonso has not spoken to the media