"We're leading in both championships, but it doesn't feel that way," said the Austrian. "In the last few years, we saw teams perform very strongly after summer shutdown, so now we need to keep pushing.
"In that respect, we're approaching the start to the second half of 2019 more like the start to a completely new season," he added, "once again we need to make sure that we leave no room for error and keep raising the bar.
"Summer shutdown was a welcome break after some very busy weeks in July and early August, but now we're excited to go racing again. While the majority of our colleagues in Brackley had the chance to recharge their batteries for the second half of the season, other team members were carrying the baton over the past weeks.
"Our team members in Brixworth worked straight through the summer break to improve the performance and reliability of our power unit; while in Brackley, we used the relatively quite days to do some work on our factory.
"It's great to come back from the summer break knowing that part of the team was still pushing flat out and we are grateful to our colleagues who kept the ball rolling while we were out of office."