British GT: Marc Warren and Jack Brown make switch to GT3 for 2026 season with Optimum

Optimum Motorsport have announced that reigning GT4 champions Marc Warren and Jack Brown will make the step un in 2026 to GT3.

Off the back of a successful season in the McLaren Artura GT4, Warren and Brown look to ride the momentum into the GT3 category. The season long battle against Ravi Ramyead and Charlie Robertson meant that the team became the first since Pro-Am team since 2016 to lift the title at seasons end. Optimum are not new to the GT3 category having taken the 720S across the globe and racing last season with Marvin Kirchhöfer and Morgan Tillbrook in the series and the team are already familiar with each other having been the team that Warren and Brown took the title with last season. The team will move to the Silver-Am class for 2026 which is only available in GT3.

With the announcement, Jack Brown said: “I’m delighted to be returning to the British GT Championship with Optimum Motorsport for the 2026 season. Marc and I enjoyed a very strong year together last season, and moving up to GT3 feels like the natural next step for us. We’re both excited to take on a new challenge and continue learning as we head into the 2026 season.”

Marc Warren added: “Absolutely buzzing to move up to GT3 this year with Jack and Optimum Motorsport. I'm itching to get out in the car and feel the speed. It’s a big step for us and we’re going up against a lot of experienced GT3 drivers so our primary concern is winning Silver-Am. We’ll be delighted if we can contend for overall results.”