Summary
Final day of pre-season testing
Sebastian Vettel fastest in the morning
Vettel tests 'halo' head protection device
Transmission problem for Hamilton before lunch
Get involved #worsteverF1mods
Get involved #bbcf1published at 12:09 Greenwich Mean Time 4 March 2016
That's lunchpublished at 12:08 Greenwich Mean Time 4 March 2016
And it is lunchtime.
Sebastian Vettel finishes the morning session fastest.
Full times, laps and tyre compounds to come.
Postpublished at 12:07 Greenwich Mean Time 4 March 2016
Image source, Getty ImagesF1 journalist Dan Knutson in Barcelona: "The screens can't hide the fact that the Merc came back on a truck."
Postpublished at 12:03 Greenwich Mean Time 4 March 2016
Jolyon Palmer sneaks an improvement in before lunch, clocking 1:24.859 on super softs.
Move along, nothing to seepublished at 12:02 Greenwich Mean Time 4 March 2016
Go! Go! Go!published at 12:01 Greenwich Mean Time 4 March 2016
The Mercedes has been recovered so there's just enough time to squeeze a couple of minutes on the track before lunch.
Postpublished at 12:00 Greenwich Mean Time 4 March 2016
So in the end it wasn't Flash Gordon, it wasn't Chuck Norris, it wasn't even the roadworks and average speed cameras on the M62 at rush hour...
Image source, Getty Images/ImgflipPostpublished at 11:56 Greenwich Mean Time 4 March 2016
Postpublished at 11:56 Greenwich Mean Time 4 March 2016
The Mercedes has been like a certain battery operated bunny - it has just kept going and going and going but it finally seems as though they have hit a snag.
Postpublished at 11:51 Greenwich Mean Time 4 March 2016
Red flagpublished at 11:48 Greenwich Mean Time 4 March 2016
A red flag just before lunch. The Haas?
No, not today, it is in fact Lewis Hamilton's Mercedes...
Where are Williams?published at 11:46 Greenwich Mean Time 4 March 2016
Andrew Benson
Chief F1 writerWilliams have been doing their usual understated job in testing, just quietly getting on with things. But on Thursday Felipe Massa finally tried a low-fuel, qualifying-style run and ended up with second-fastest time.
Williams appear to be about where they were last year - third behind Mercedes and Ferrari. Chief technical officer Pat Symonds said: “I think in absolute terms, positionally, we are looking to be in a similar position to last year. I believe we are a little closer to Mercedes and Ferrari. A huge pack snapping at our heels. It does appear to be quite close in the midfield. On the face of it, I don't think Mercedes have grown the gap.”
However, he added that the vagaries of testing meant it was “quite easy” to get those assumptions wrong.
Gotta test them allpublished at 11:44 Greenwich Mean Time 4 March 2016
Get involved #bbcf1published at 11:44 Greenwich Mean Time 4 March 2016
No worries Dean - so from softest to hardest:
Ultra soft; super soft; soft; medium; hard.
Postpublished at 11:41 Greenwich Mean Time 4 March 2016
Postpublished at 11:41 Greenwich Mean Time 4 March 2016
Like I said, give it a minute or two.
Several cars head back out on to the circuit for the final 20 minutes of testing. Sergio Perez, third fastest on super soft so far, is out on ultra soft.
All going to planpublished at 11:37 Greenwich Mean Time 4 March 2016
Postpublished at 11:33 Greenwich Mean Time 4 March 2016
Wondering what's happening on the track?
Nothing. No-one is on it.
Give it a minute or two though...
Postpublished at 11:30 Greenwich Mean Time 4 March 2016
Pretty sure I've seen that somewhere...
Image source, Getty ImagesGet involved #worsteverF1modspublished at 11:26 Greenwich Mean Time 4 March 2016