@Ubah: Button signed a multi-year deal for McLaren last year, so it's unlikely to be his last year. In fact, half of the delay last year was probably down to Button pushing for a long-term deal - or at least one that didn't see him on the scrap heap at the end of 2015.
@SD: A move for him seems unlikely as Ron Dennis recently said there is no performance-related opt-out clause in his McLaren contract, meaning he's basically locked into a deal unless he pays to leave like he did at Ferrari.
@Tungath: That allows teams to judge air flow from different bits of aero on the car.
@anagh: No idea what's happening with Ferrari at present, we haven't heard anything. Perhaps a long Italian lunch?
@Aditya: Hamilton has just returned to the pits after that run on the medium tyre.
@charbel_salloum: This track isn't the best indicator of tyre degradation as it's so unlike any other on the circuit. The teams will start focusing on tyres properly in Barcelona.
@lachu: We've not been able to go trackside so far yet so that's a hard one to answer. We should in the next two days, however, so keep coming back.
@kevin: At the moment yes, it put its delays down to "recurring" issues.
Hamilton came to a halt at the end of the pit lane at the end of that last run. Mercedes ran to the end of the pit lane to wheel him back to the garage.
@hacke: For the time being yes.
I tell a lie - Sebastian Vettel has just returned to the track.
It's just the red Ferrari of the four-time world champion out there currently.
@Salman: Good exposure, primarily.
Some fairly pacey laps from Vettel early on, he's out there on medium tyres.
@JanVenegoorofHesselink: That's a random question! I support Ipswich Town - in the second tier of English football - for my sins.
There's a few spots of light rain falling in Jerez.
@ONZ: No-one is sandbagging on the second day of testing. All just running very different run plans.
@Santa: He's currently on medium compounds.