Friday 21 March at 09:33 : Lewis Hamilton in Malaysia has fended off suggestions that he should dump his father Anthony as manager.

Triple world champion Sir Jackie Stewart was quoted recently as questioning the McLaren driver's decision to eschew professional agents in favour of continuing to be managed solely by his dad.

But championship leader Hamilton, 23, at Sepang branded his father as "the best manager in the paddock".

"You should see him in action -- he's very, very good," the Briton said.

Hamilton admits that their relationship often comes under strain.

"But that's just because he wants the best for me," he said.

"I guess it's harder than in other working relationships because there's more emotion involved. But we work around it.

"He does things for the right reasons, rather than for money or to better himself," Hamilton added.