Image source, Getty Images

Mercedes may have led the way once again in final practice but the signs are that neither Nico Rosberg or Lewis Hamilton can afford for any margin of error.

There was just 0.2s between the top four in FP3, 0.9s between the top 12.

Add to that high altitude, a slippery surface and a circuit that no current driver has raced on before, and we could be in for a very thrilling hour of qualifying...

OK, we are going to take a very short break but will be back with build-up for qualifying at 18:00 GMT. In the meantime, I'll leave you with Andrew Benson's final practice report.

See you shortly.

For the home fans, who are continuing to stream into the stands, Sergio Perez was just half a second off Nico Rosberg's pace. 

A Mercedes one-two in final practice, but the exciting thing ahead of qualifying is that Nico Rosberg, Lewis Hamilton, Daniel Ricciardo and Sebastian Vettel were separated by just two tenths of a second. Could be very close indeed.

1) Rosberg 2) Hamilton 3) Ricciardo 4) Vettel 5) Kvyat 6) Perez 7) Bottas 8) Sainz 9) Massa 10) Hulkenberg

11) Verstappen 12) Maldonado 13) Grosjean 14) Ericsson 15) Alonso 16) Nasr 17) Raikkonen 18) Stevens 19) Rossi 20) Button

Sergio Perez, currently sixth fastest, opts to indulge in a bit of crowd pleasing as he slows down through the stadium section, waving to the crowd as he weaves his way through.

Nico Rosberg is in the pits, so there will be no improvement from him.

Image source, Getty Images

Better from Lewis Hamilton as he improves with a 1:21.150, half a second slower than Nico Rosberg. Just over two minutes remaining, so he has time for another lap.

As it stands Nico Rosberg leads from Hamilton, with Daniel Ricciardo (1:21.201) and Sebastian Vettel (1:21.294) third and fourth respectively. Not much between them.

Big lock-up for Lewis Hamilton coming into the first corner and he skips across the grass before rejoining. 

He's now dropped down to seventh fastest, having yet to show his real pace on the soft tyres. 

"Nico's backing up into me," he says over team radio.

"You've got plenty of space behind," is the response.

A polite way of saying get on with it...

Daniil Kvyat, fastest of all in the middle sector, splits the Mercedes to go second fastest with 1:21.530.

Nico Rosberg goes fastest with 1:21.205, Lewis Hamilton is yet to set his first lap time on the softer compound.

With 10 minutes to go, Lewis Hamilton has been in to make the switch to the soft tyre, as has his Mercedes team-mate Nico Rosberg. Let's see what they have got hiding in the bag.

Let me hear you say, 'Hey-oh'?

Mercedes aren't getting a group rendition of the Outhere Brothers going, they're just celebrating Lewis Hamilton topping the timesheets. Even more impressive is that he has done so on the medium tyres. The only driver to get close to his time, Sebastian Vettel, set his on the faster soft tyres. It looks like Mercedes are, once again, looking strong.

It is relatively quiet on the circuit as everyone except for Lewis Hamilton and Marcus Ericsson head in to prepare for their qualifying sim runs. 

Jenson Button appears to have been battling some mechanical woes and has managed just four laps in this session. He is yet to post a representative time with his best effort so far, a 1:29.336, six seconds slower than Fernando Alonso's.

Image source, EPA

Twenty minutes remaining and Lewis Hamilton, still on the medium compound, jumps into P1 with 1:21.840. Impressive stuff.

He leads from Sebastian Vettel. Max Verstappen and Nico Rosberg, who is also on the medium compound tyre.