Mercedes Formula 1 boss Toto Wolff says despite a “solid” lead in both championships the team cannot afford to cease development on its 2019 car.

The German manufacturer has built a commanding margin over its rivals, putting to bed fears its pace in pre-season testing had left it far behind on pure performance.

A record-breaking five successive one-two finishes in the first five races was the catalyst for a dominant first half of the season. Mercedes sits 154 points ahead of Ferrari, while Lewis Hamilton holds a comfortable lead in the drivers’ standings.

While it seems a formality Mercedes will wrap up both championships for the sixth year running, Wolff doesn’t see it as a reason to take its foot off the gas.

“The intensity is still on for 2019, and there’s seven races to go,” Wolff explained, as quoted by Motorsport.com.

“We have a solid gap in both championships but obviously a streak of one or two really bad weekends can make it swing in the other direction, so we’ve got to keep pushing and this is what we’ll do.

“You can’t take anything for granted. We knew that Spa and Monza would be difficult for us, and this is how it happened.

“Singapore on paper looks much better for us and the [Red] Bulls. But I have no doubt that Ferrari will also have learned in the meantime and will have a better package there, better than [they had in] Hungary.”

Mercedes goes into Singapore having won four of the past five races at the Marina Bay circuit, the only blip coming in 2015 when Sebastian Vettel took honours for Ferrari.