Stofel Vandoorne has put up his first timed lap of the day for McLaren, a 1:27.564 on the soft tyre.

That won't blow too many skirts up but at least it's a start.   

Ah, there we are. That's woken us up.

Lewis Hamilton pumps in a 1:21.766 on the soft tyre, which is just 0.001s slower than his quickest time of the day yesterday, which was also set on the yellow-walled Pirelli. 

Lovely consistency.

No cars on track so here's where we are with 90 minutes gone. 

Just five cars have set times.

1. Raikkonen, Ferrari 1:23.718 (14 laps) Medium

2. Hamilton, Mercedes 1:24.026 (13) Soft 

3. Verstappen, Red Bull 1:24.366 (12) Soft

4. Stroll, Williams 1:26.040 (12) Medium 

5. Kvyat, Toro Rosso 1:28.616 (11) Medium  

All this talk of T-wings got me thinking about X-wings, which sprouted on F1 cars in 1997 and 1998 after respected Tyrrell designer Harvey Postlethwaite got creative in a bid to revive the fortunes of the once-great team.

The X-wings were not universally loved due to their arresting aesthetics, but they were effective and by early in 1998 many teams had adopted them.

However, that was the cue for the FIA to step in and outlaw them on safety grounds. 

Will the same fate befall the T-wing?

Image source, Getty Images

Image source, Getty Images

I will pay good money to the F1 mechanic who can make this happen.

And no sooner have I said that than Raikkonen goes quicker again, doing a 1:23.718 on the medium tyre to move into first place. 

Neither Ferrari driver has bolted on a set of soft tyres as yet.  

Raikkonen is currently in second place with a best time of 1:24.610. 

A 1:24.026 sees Lewis Hamilton go back to the top of the order, seven tenths clear of Max Verstappen.  The Briton set that time on the soft tyre and has now completed 13 laps.

You views on today's action in Barcelona are, as always, very welcome. 

Get in touch via #bbcf1.

Dan Knutson
F1 journalist in Barcelona

It’s been an “aero rake” morning. 

Ferrari, McLaren, Mercedes and Red Bull – Max Verstappen’s car seen here – are among the teams running the rakes which use Kiel probes to map the airflow across the full area of device.

Image source, Dan Knutson

The lead changes hands again and now it's the Red Bull of Max Verstappen staring down disdainfully on the rest.

The Dutchman does a 1:24.794 on the soft tyre but we are still three seconds off yesterday's best times - although we of course have no idea what fuel loads these cars are running. 

Andrew Benson
Chief F1 writer

While the troubles of McLaren and Red Bull attracted the most attention on day one, Force India also had a difficult day. Sergio Perez managed seventh fastest time but he completed only 39 laps - “not a lot,” as the Mexican put it. 

The main problem was an exhaust failure which curtailed running in the afternoon, and Perez sounded distinctly underwhelmed by his experience of the new rules. “Not a massive difference and it is still very early days,” he said. 

“My balance today was not very good and I expect more to come from there. I was expecting a lot more grip.” 

Esteban Ocon has taken over the car today.

Dan Knutson
F1 journalist in Barcelona

Honda’s “oil system” problem that kept Fernando Alonso’s McLaren in the garage for much of yesterday was indeed caused by the shape of the oil tank which did not allow the oil to be properly scavenged. 

The tank was modified prior to the first day of the test, but the problem persisted. 

Further modifications were made to the tank last night.

The Williams got away from the Canadian at turn nine but he quickly rights it and goes on his way.

We're green again.

Red flagpublished at 08:43 Greenwich Mean Time 28 February 2017

08:43 GMT 28 February 2017

Lance Stroll seems to have overcooked it in the Williams and has spun.

We have a new leader and it's Canadian rookie Lance Stroll who finds himself atop an F1 timesheet for the first time. 

The 18-year-old Williams driver - brought in last season to replace Felipe Massa but who now finds himself team-mates with the Brazilian after Valtteri Bottas' move to Mercedes - posts a time of 1:26.089 on the medium tyre to displace Hamilton. 

Image source, Getty Images

Andrew Benson
Chief F1 writer

It’s hard to feel sorry for someone who earns $40m a year, but a little bit of your heart has to go out to Fernando Alonso right now. Still arguably the best driver in the world, he has not won a race since May 2013 and he does not look like he is going to this year, if the first day of testing is anything to go by. 

An oil-system problem - reported to be rooted in a new-shape tank - limited the Spaniard to just two hours’ running and 29 laps. He was “disappointed and sad,” he said.

But he was still looking for positives: “The only conclusion I can take is that the car looks nice, it’s definitively faster in the corners and it’s good to come back to that feeling of having more downforce in the corners and being able to push the car a little bit more. I like that, I saw some of the other cars when I was running and they also look good. I’m happy for that, happy for the sport as it’s going in the right direction and, probably, apologise to the fans for the last five or six years because they saw horrible cars.”

Alonso said it was far too early to start talking about cutting team-mate Stoffel Vandoorne’s time in the car to equal things out. “We don’t know what will happen,” Alonso said. “Maybe Stoffel has an even worse day on Tuesday. Maybe I have to share my other day with him, so let’s wait and see.”

Image source, EPA