David Coulthard says the friendship between Lewis Hamilton and Nico Rosberg has "spectacularly" broken down in their time together at Mercedes.

Hamilton secured his third world drivers' championship at Mercedes ahead of Rosberg at the United States Grand Prix last weekend, but contact on the first lap, and a 'hat throwing' incident after the race, has brought the team-mates relationship into the spotlight once again.

Coulthard and Perry also discuss Hamilton's admission that he is a difficult team-mate, with Coulthard describing his as a "hardened racer".

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