Lewis Hamilton refused to be drawn on calls for the FIA to make changes following McLaren's failed appeal and instead insisted he was focused solely on capturing his first world championship title.

The International Court of Appeal ruled as inadmissible McLaren's protest at the 25-second drive-through penalty given to Hamilton at the recent Belgian Grand Prix.

As a result, Hamilton's lead at the top of drivers' standings is only a point over Felipe Massa, of Ferrari, going into this weekend's Singapore Grand Prix.

Sir Jackie Stewart yesterday demanded that the FIA employ permanent, professional stewards for each race to ensure consistency in their decision-making.

However, when asked for his opinion on the three-time world champion's comments, Hamilton said he has put the decision behind him to concentrate on picking up the points he needs in the remaining four races. "Its not for me to comment on it," the 23-year-old said. "I haven't spoke to Jackie or read any comments. I am not focusing on the past and I am just moving forward and concentrating on the next race."

The hearing was an unwelcome distraction for Hamilton ahead of Formula One's first night race on Singapore's street circuit. But the Stevenage-born driver insisted it had not affected his preparations as he looks to claim his fifth victory this season. "It didn't really disrupt my week to be honest because I went straight to the airport and got on the plane," he said. "We went there and gave it our best shot. Perhaps it wasn't the best result but we move on.

"It is all in the past and we must focus on the next four races. We approach them with the same confidence as we have the last ones. We have come here no different to how we went to Monza and we are just going to try and do a good job."

Hamilton insists he will not be fazed by the prospect of rain in Singapore.

Thunderstorms and rain have been forecast for the race, leading to concerns over reflection and glare from the lights off water collecting on the circuit. However, Hamilton has every confidence in his car to perform regardless of the conditions.

"The weather forecast says it will rain all week but every time I have woken up it is dry and quite warm," Hamilton said. "It has been raining in the morning but has stopped by the time I get up so hopefully it will be the same this weekend.

"We always hope for a dry race as it is a lot easier to keep the car on the track and push it to the limit.

"If we had a slower car in the dry I'd probably be praying for the rain but the fact is we have a competitive car in both conditions."