Christain Horner admits frustration after last-lap loss

Red Bull Racing team boss Christian Horner refuses to criticise Sebastian Vettel after the world championship leader threw away the lead of the Canadian Grand Prix on the final lap.

Vettel ran wide to allow McLaren's Jenson Button to snatch his first race victory of the season.

Horner admits it was a 'frustrating' day but is pleased that Vettel's 'main rivals' failed to score following non-finishes for both Lewis Hamilton and Fernando Alonso, as well as having both of his cars on the podium.

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