Taking over from yesterday's pace-setter, Felipe Massa, Valtteri Bottas continues to impress in the Williams, the Finn topping the timesheets as the teams break for lunch on the final day of pre-season testing.

Having failed to complete a single lap yesterday, things are a little better for Sebastian Vettel and his team today, but only just.

Around an hour before lunch the German spun at T1 - now renamed in honour of his countryman Michael Schumacher. Once back in the pits the world champion changed out of his overalls suggesting that his team has major work to do on his car.

While the new regulations mean that (initially) almost every job takes at least twice the time it used to, it's understood the spin was due to a brake disc failure - nothing to do with power units, packaging, software or overheating - so hopefully he'll get some decent running this afternoon.

Another driver suffering today is Lewis Hamilton, Mercedes never quite capturing the form shown last week, the team is suffering numerous technical problems. The Englishman, who it is understood encountered a gearbox issue, didn't appear until shortly before the break leaving time for just 5 laps.

Problems for Lotus also, Romain Grosjean bringing out the red flags when he stopped on the back straight shortly before lunch, he and Vettel being the only stoppages over the course of the morning. It's understood that Lotus' problem relates, yet again, to software.

After a dreadful day yesterday, when he completed just one lap, things have been altogether better today for Adrian Sutil, the German having completed 91 laps thus far on his way to fifth place. This afternoon he hands the C33 over to teammate Esteban Gutierrez.

Then again, this demonstrates the erratic reliability of some of the cars this season, perfect one moment then side-lined the next, not that Williams or Force India appear to be suffering such issues.

With just four hours of pre-season testing remaining before the teams pack up for Melbourne we can expect this afternoon to be very busy.

Midday Times - All Times Unofficial

Name	Team	Laps	Time	Gap
Bottas	Williams	60	1:34.797	127.711 mph
Alonso	Ferrari	27	1:35.509	0.712
Hulkenberg	Force India	30	1:35.577	0.780
Vergne	Toro Rosso	43	1:35.701	0.904
Sutil	Sauber	91	1:36.467	1.670
Button	McLaren	18	1:38.111	3.314
Hamilton	Mercedes	5	1:38.650	3.853
Kobayashi	Caterham	58	1:38.653	3.856
Grosjean	Lotus	24	1:39.517	4.720
Vettel	Red Bull	44	1:39.708	4.911
Chilton	Marussia	10	1:41.242	6.445