Lilian Calmejane's advantage is tumbling down and the Frenchman sits up to be caught by the 28 riders behind, getting a tap of acknowledgement from Direct Energie team-mate Fabien Grellier.

Peter Sagan hits the front and the breakaway becomes 29 riders again, leading the peloton by 6'40'' now.

Sir Bradley Wiggins speaking on ITV4: "Mark Cavendish will be back - he's had a pretty up and down year with crashes. He's not returned to the form he was at two years ago but the problem with Cav is he sets his standard at winning four stages minimum so if he doesn't do that, he's judged against past years. That's the side-effect of his greatness.

"He's already thinking about what he can win next. I don't think we've seen the last of Mark winning Tour de France stages.

"In terms of winning classics - we've seen him win Milan- San Remo and up the front of the cobbled stage on this Tour. He could contend in races like Paris-Roubaix but I don't know how he wants to see out the final years of his career. There is talk of him going back to the track for 2020 Olympics."

Lilian Calmejane is still off the front, with a gap of 54 seconds over the 28 chasers and now nearly seven minutes ahead of the peloton.

Arnaud Demare, who fell almost two minutes back during today's brutal start, has made it back to end of the peloton. Chapeau. Hopefully he can just sit in for a while now.

In a cruel twist, the race actually has to also go over the Col de la Bassine today - it's been a category three climb before in the Tour, though from the tougher other direction, hence why it's not categorised here.

It's still far from flat though. Lilian Calmejane is en route to it, 1'19'' in front of the 28 chasers and 6'25'' ahead of the peloton.

Serge Pauwels pops off the front of the chase to take second place and three points in the mountains classification.

He's in third place in that competition, now on 66 points, behind Warren Barguil in second place, on 70 points, and Julian Alaphilippe, who leads with 92 points.

Neither Barguil nor Alaphilippe have made it into the break and there are a maximum of 10 points left today for the first man over the top of the Pic de Nore.

Lilian Calmejane stays solo over the summit of the Col de Sie, taking five points in the king of the mountains classification.

The Frenchman still has a lead of 1'15'' over the 28 chasers.

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Sir Bradley Wiggins is back on ITV4's coverage today.

He had a bit to say yesterday...

Lilian Calmejane has opened up a gap of almost a minute with under 5km to go to the summit of the Col de Sie.

This would be a remarkable ride if he stays clear to the finish.

He has form - winning stage eight solo last year - but he didn't attack from this far out.

Here are the 29 riders in the breakaway: Daniel Martínez (EF Education First), Silvan Dillier (Ag2r La Mondiale), Nikias Arndt (Team Sunweb), Amäel Moinard and Florian Vachon (Fortuneo - Samsic), Sonny Colbrelli, Ion Izagirre and Domenico Pozzovivo (Bahrain - Merida), Damian Howson and Daryl Impey (Mitchelton - Scott), Daniele Bennati, Imanol Erviti and Marc Soler (Movistar Team), Greg van Avermaet (BMC Racing Team), Niki Terpstra (Quick-Step Floors), Peter Sagan, Rafal Majka and Pawel Poljanski (Bora - Hansgrohe), Magnus Cort and Michael Valgren (Astana Pro Team), Serge Pauwels (Team Dimension Data), Arthur Vichot (Groupama - FDJ), Lilian Calmejane, Fabian Grellier and Romain Sicard (Direct Energie), Bauke Mollema, Julien Bernard and Toms Skujins (Trek - Segafredo) and Jesús Herrada (Cofidis).

Calmejane is off on his own for now, 40 seconds in front of the other 28 riders.

There isn't much flat land in the Massif Central and the race is currently on the long drag up towards the Col de Sie.

The peloton have 127km to go so are about 3km down on the break.

Lilian Calmejane has attacked solo off the front of the breakaway.

Image source, Tour de France

That group of 29 riders now lead by over four minutes.

Some idiot releases a blue flare right next to the peloton down the road and one rider tries to slap it out of his hand.

Matt Taggart: Sagan's in the break and Kristoff's back in the peloton. The green jersey is going to be mathematically settled today.

Peter Sagan is currently 267 points in front of Alexander Kristoff in the points classification.

There are 330 points currently left in the race, with 50 on offer today. So if Sagan takes 14 points today and Kristoff gets none, the world champion will lead by an unassailable 281 points.

At that stage all he needs to do is finish the race to take a record-equalling sixth green jersey.

Confirmation that 29 riders are up the road - including former yellow jersey Greg van Avermaet and world champion Peter Sagan, who is looking for a fourth stage win of this Tour.

They have quickly extended their lead to 1'34'' over the peloton.

That means after an hour of frenzied attacks and counter-attacks, the breakaway has formed and things should settle down for a while.

Phew.

A group of over 25 riders have now broken clear and established a gap of 27 seconds.

It looks like every team that wants to be are represented and there are no threats to the overall leader.

Team Sky are content to fan across the peloton and slow it down after a frenetic start.

Team Sky look happy with the constitution of the group and try to shut down attacks.

But several riders aren't happy with that and put in another dig.

Geraint Thomas comes to the front to just check no threats are zipping away.

Peter Sagan puts in a stunning dig to bridge across.

Another surge from the peloton sees a large group go off the front. Could this finally be it?

Now Peter Sagan takes responsibility to put a dig off the front and try to force the selection.

As you expect, the world champion is a marked man and has to sit up.

Tomorrow is a rest day and it looks like plenty of riders could use it, given how scrappy the racing has been today.

And our commentary team of Rob Hayles, Gareth Rhys Owen and (eventually) Tom Fordyce look like they need it too...

Hopefully they will have recovered in time to bring you live commentary of stage 15 from 15:30 BST.