Heidfeld apologises to Yamamoto

The German was furious after the race in Shanghai when his efforts to hold onto fourth place on the final lap were wrecked when he lost time battling with Yamamoto's teammate Takuma Sato.

Having then got caught up in a collision with Rubens Barrichello at the hairpin after being slowed by the Super Aguri car, Heidfeld was told that Yamamoto had been the guilty party - and he stormed over to the Japanese driver to vent his frustration.

"I was not sure actually who it was," Heidfeld told autosport.com in Suzuka. "I thought when I saw it on the track that it was Sato, but then someone said to me that actually it was Yamamoto.

"So I went straight to him and complained. And he obviously didn't know what I was speaking about, which made me even more angry, because I just thought: 'How can you not know what I am talking about?'"

Heidfeld only found out about his case of mistaken identity late on Sunday evening in Shanghai and, realizing his error, he went to see Yamamoto once he arrived at Suzuka today.

"I've seen him and talked about it and it is fine now," added Heidfeld.

And although he is still disappointed by losing fourth place to Button, Heidfeld has said he is no longer as angry as he was on the Sunday night in Shanghai.

"It took a couple of days to get over it, but now I am fine," he explained. "It was very disappointing. I thought I had the fourth position quite safe, a good gap to the people behind, but then it was taken away from me."