RT With 5 minutes left in the morning session, we break for some work on the car. Nico is in P2 with 49 la... bit.ly/1TUP9Up #f1

RT Lunch break fun, Part Deux: Chief Race Engineer Tom talks to about the new tyre rules!: Racing Point F1 Team:... bit.ly/21JEH4G #f1

RT Back underway for the afternoon session! is already on track, and has added 5 laps to his pre-lunch to... bit.ly/21JEEG9 #f1

RT In case you missed it, F1's drivers not happy about 'complicated' qualy revamp: Sky Sports F1: In case y... bit.ly/21JFDGc #f1

RT Watch: Ferrari trial the new Halo device...: Sky Sports F1: Watch: Ferrari trial the new Halo device... ... bit.ly/21JFBhq #f1

RT How the teams are shaping up so far in: Sky Sports F1: How the teams are shaping up so far in #F1Testing... bit.ly/21JFBhw #f1

RT Running late for an appointment, Lewis? The world champ is back in action this afternoon: Sky Sports F1:... bit.ly/21JFBhC #f1

RT I'd love to see some lap times with the so we could compare them to times without it. Doesn't look ver... bit.ly/21JFDGi #f1

RT 57 laps done, time for lunch.: McLaren Mastercard Formula 1 Team: 57 laps done, time for lunch. #F1Testing #FA14 pic.twitter.c... bit.ly/21GhxPW #f1

RT NEXT UP: Well, of course....: Mercedes-AMG PETRONAS F1 Team: NEXT UP: Well, Lewis Hamilton of course.... #F1 #F1Testi... bit.ly/1TUVYFl #f1

RT Our man heads out onto the track this afternoon. With the sun shining it's: Mercedes-AMG PETRONAS F1 Team: Our man #L... bit.ly/21JKY0l #f1

RT Love a bit of slow-motion F1 action....: Mercedes-AMG PETRONAS F1 Team: Love a bit of slow-motion F1 action.... https:... bit.ly/21JKWWi #f1

RT When one pit board is not enough...: Tobi Grüner 🏁: When one pit board is not enough...#AMuS #F1 pic.twitte... bit.ly/1Y58PoS #f1

RT Williams failed first FIA crashtest with new nose. But apart from that all is good. AMuS:: Tobi Grüner 🏁: W... bit.ly/1Y58Pp0 #f1

RT We got info about brake issues at Haas in the morning. Not sure if they are to blame for Grosjean off. ... bit.ly/1TrxsNE #f1

RT Majority of fans against halo. Engineers raise safety concerns for certain scenarios. AMuS story (Germa... bit.ly/1Y58PFv #f1

RT Back under way in Barcelona No more fun like this today for - it's Lewis Hamilton's turn: Formula 1: Back un... bit.ly/1TaOEXm #f1

RT VIDEO: The best of in spectacular slow-motion >>: Formula 1: VIDEO: The best of #F1Testing in spectacular sl... bit.ly/1TaOEXu #f1

RT Romain Grosjean has been into the gravel at Turn 1 Back racing again after the incident is cleared: Formula 1... bit.ly/1QnrGZu #f1

RT 1 RAI 1:22.785 (ultrasoft) 2 HUL 1:23.251(ultrasoft) 3 VES 1:23.382 (ultrasoft) 4 ROS 1:24.125 (medium)... bit.ly/1QnrGZz #f1