Four cars including both guest entries and two full season McLarens have withdrawn from the Donington Park race this weekend. It leaves the series with a 34 car entry list.
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2023 will see Aston Martin return along with former champions Andrew Howard and Ross Gunn at Beechdean AMR.
DTO Motorsport will join the British GT Championship, running a McLaren Artura GT4 for Aston Millar and Josh Rowledge.
Rivals have united to bring a Shaun Balfe driven Barwell Motorsport run Lamborghini to the 2023 British GT Championship.