Engineer: "Yep let's cool the brakes."

Ocon: "Yeah, failure, failure. Lots of smoke."

Sergio Perez is fastest in the first sector and his pace lasts to the end of the lap as the Mexican goes top of the board with a 1:15.660 on the medium tyres.

Esteban Ocon, meanwhile, has been on the radio to say he is struggling with his Alpine.

Fernando Alonso has joined Charles Leclerc on the red-banded soft tyres and he slips into fifth place with a 1:17.235.

Alex Albon is having some issues in the Williams. "My seat is very hot on the left side," he tells his pit wall.

All change behind the Red Bull pair.

Charles Leclerc, desperate for a clean (and hopefully winning) weekend moves up into third place with a 1:17.133.

A few drivers are flirting with the walls already. Careful now...

George Russell informs his Mercedes crew it's quite gusty out on track.

Sergio Perez has joined his Red Bull team-mate at the top of the board with a 1:17.089. Valtteri Bottas in the Alfa Romeo had put his car up into third, but the Finn is pushed down to fourth as the Aston Martin of Sebastian Vettel takes his spot.

Some news from the Mercedes garage. The team has been tinkering a little bit...

Hit the audio icon at the top of the page to have a listen.

Right, couple of times on the board already.

Max Verstappen tops the sheets with a 1:17.991, Lewis Hamilton has slipped into second, six tenths behind the world champion.

Carlos Sainz and Daniel Ricciardo make up the (early) top four.

Yuki Tsunoda in the Alpha Tauri and Ferrari's Charles Leclerc are the only two drivers to go out on the soft tyres, everyone else has opted for the mediums.

Pirelli have allocated the softest tyre compounds in the range for a third consecutive weekend.

Take your pick between the C3 (hard, white), the C4 (yellow, medium) and the C5 (soft, red).

What the strategy will be for Circuit Gilles Villeneuve's return remains to be seen, as the previous data is a good three years old, plus we're racing in an era of new cars and 18-inch tyres that are yet to get a run out on the Canadian track.

And of course, don't forget about these little fellas when you're brushing up on your Canadian Grand Prix notes.

Image source, Getty Images

Drivers will need to blow away the cobwebs and do some revision to reacquaint themselves with Montreal's 14 corners and heavy-braking chicanes.

Image source, BBC Sport

Yikes. A dark, ominous cloud is lurking over the circuit. Get out quick and get some running in.

The crowd are in full flow in the grandstand. Not a spare seat in the house.

Lovely to have you with us again, Canada.

BBC Radio 5 Live Sports Extra

Jack, Jennie and Andrew are joined by Williams reserve driver, Jack Aitken in the commentary box for this weekend's event.

First practice is online-only, so click the audio icon at the top of the page to listen in.

Any questions you have for Jack Aitken, and the rest of the team, use the hashtag #bbcf1 on Twitter.

Image source, Getty Images

Fresh from his Monaco Grand Prix victory, Sergio Perez put his hand further in the bucket as a championship contender with a second-placed finish last weekend.

Perez made a terrific start to the race in Baku, catching Leclerc on the inside at Turn One after the Ferrari man had locked up to take the lead.

Although the order was swapped around by the end of lap 14 with team-mate Verstappen taking control, the Mexican did pick up a bonus point for fastest lap and is now second in the drivers' standings.

"We were not perfect today, there’s so many things to improve and to understand," Perez said. "But at the end of the day was a great result for the team."