Kayleigh‍: How do you even cut down 21 tracks to 15?! I can only think of one track - Monaco, I'm looking at you hun - to get rid of. Maybe some of the European grands prix? It's too hard!

Adam Varley: Serious things need to change to the actual racing at Monaco, can't have a repeat of this year's race! But at the same time, what can be done? And it is the jewel in the crown isn't it? I'd cut down on the street circuits like Singapore.

David Ferguson: 18 races is plenty. I'd drop Monaco - it's usually the dullest, most tedious race of the year. Baku is dreadful too unless you enjoy a demolition derby.

With not much going on, it is a good time to have a listen of the Chequered Flag Podcast. You're welcome.

Lots of rain, no cars out there. Everyone has retreated to the safety of the garages. We have 40 minutes left if anyone is feeling brave.

Not too sure Carlos Sainz will be agreeing with that.

Carlos Sainz has just skidded off the wet track. No wall or barrier hit. He is told to get himself back into the pits.

His Renault team-mate Nico Hulkenberg is the only man to set a timed lap, a 1:36.873, 23 seconds slower than our best times yesterday.

Image source, Getty Images

Andrew Benson
BBC Sport’s chief F1 writer

There has been a bit of fevered speculation this morning about Lewis Hamilton. There was gossip in the paddock that he might have some form of leg injury that might prevent him taking part in this final practice session.

Mercedes have denied it. A Mercedes spokesman said: “He’ll be driving the session, depending on the weather.” He said Hamilton had no leg injury.

Image source, Getty Images

Before we got going, Stoffel posted this post on Twitter. You could just imagine him saying 'just work, please work today'.

Andrew Benson
BBC Sport’s chief F1 writer

If McLaren’s problems as a team are bad enough - they have apparently still not got to the bottom of understanding fundamental aerodynamic problems in their car - spare a thought for Stoffel Vandoorne.

The Belgian, fresh from a difficult weekend at Silverstone, where he was 0.9secs off team-mate Fernando Alonso in qualifying, he was again struggling on Friday at Hockenheim. He described it as “the worst Friday of my career - it’s similar to Silverstone. Something is not working on the car and for us it is a question of how to get the car back to a normal condition and then see how it works on Saturday.”

Vandoorne said it was “impossible” for the gap to Alonso to be as big as it was - 0.6secs. “We don't understand how to get the car to work,” he said. “We have to find a solution. We can see we've got big problems but we don't know how to get the car in a normal condition.”

Image source, Getty Images

The conditions are not good enough for anyone to fancy a flying lap just yet.

Stoffel Vandoorne, 20th in both sessions yesterday, is asked if he is happy with the conditions. "Yep, happy," is the quick response.

Image source, Getty Images

Luke Parsons: To be honest I'd keep them all, but have different tracks for alternate years. Will reduce costs of GPs if some are held every two years.

Hans‏: How many races and where? 20 races, Imola must return. And Nurnburgring or Hockenheim must be on it. All the historic tracks must be included (where it's still safe). And all the boring stuff gone!

Casey Jennett‏: We should have 16 races, keep the historic races (Italy, Belgium, Britain, Monaco, France, Germany), bring back full Nurburgring, keep COTA, would like to see Brands or Donnington do a European GP. Keep other tracks, and maybe the Miami GP if it's a good track.

Romain Grosjean, Kevin Magnussen, Charles Leclerc, Brendon Hartley and Lance Stroll all take to the track to have a look and see how bad things are.

Jolyon Palmer
Former Renault driver on BBC Radio 5 live

There is a lot of water coming from Ericsson's car. The other drivers will be watching this and might leave it for a while. There is not much they can learn at the moment.

He was super cautious, there is a lot of water and the rain has come down very quickly. There are proper puddles out there.

Image source, Getty Images

We are under way with Marcus Ericsson taking to the wet track, on the full wet tyres. One hour of practice coming up. Could be very lively.

It was 50 degrees at track level yesterday. Today we have some rain to keep everyone on their toes.

We are live on BBC Radio 5 live right now and you can listen along by pressing the play button at the top.

Jack Nicholls, Jennie Gow and Jolyon Palmer are our commentary team.

As well as the talk about the future of the German Grand Prix, you may well have seen quotes from Renault boss Cyril Abiteboul, who believes grand prix racing would benefit from an "aggressive" cull of races that reduces the calendar to as few as 15 races., external

So that is our talking point for today and we want to put you in charge of sorting out the Formula 1 calendar.

How many races do you have? Which races stay? Which races go? Are there any new destinations that should host a race? Do any races need to be held at different times of the year?

Don't forget to include reasons why.

Tweet us using the hashtag #bbcf1 and we will post your messages in this page throughout the day.

Image source, Getty Images

We are at Hockenheim this weekend, but will we be back here next year? At the moment there is no contract and the Hockenheim track is hoping to keep the race on the F1 calendar, but for a lower price.

Championship leader Sebastian Vettel is one of those hoping to return to his home country next year. "It would be a shame to lose one of the classic races," he said. "It has so much history, Germany is so well known for car manufacturers. "[But] you have pay money to get a grand prix."

Image source, .

Andrew Benson
BBC Sport’s chief F1 writer

Can Red Bull buck their own expectations and mix it with Mercedes and Ferrari this weekend? They were unexpectedly competitive on Friday - Daniel Ricciardo topped the first session and Max Verstappen the second.

They lost out on the long straights of the middle sector of the lap but were super-quick in the twists and turns of the Stadium section at the end of the lap. It was not a trouble-free day by any measure.

Ricciardo had a spin at Turn Eight that meant he missed his qualifying simulation and Verstappen had an oil leak that put the kibosh on his race-simulation run. But the Dutchman was quietly confident. “It was a nice surprise to start so competitively here but we have to remember it is only Friday,” he said. “The others will be quicker for qualifying but certainly a better than expected start.”

Image source, Getty Images

It looks like Max has got his wish.

Here's BBC Weather's Ian Fergusson...

*starts a little rain dance*