Barnicoat topped the times in Saturday’s opening qualifying session aboard the McLaren 720S GT3 he shares with Ollie Wilkinson to grab pole for the first of the two races on Sunday.
It was the first time that a McLaren has qualified at the front of the field since 2016 when Alvaro Parente took the top spot in a Garage 59-run 650S GT3 at the Nurburgring when the championship was known as the Blancpain GT Series Sprint Cup.
The Jota McLaren jumped to the top of the timesheets in the closing minutes of the 20-minute opening session with a 1m24.341s lap of the former British Grand Prix venue.
That knocked championship leader Charles Weerts’ WRT Audi R8 LMS GT3 off the top spot.
The Belgian driver’s 1m24.413s was then bettered by Timur Boguslavskiy, who posted a 1m24.405s in the fastest of the Auto Sport Promotion Mercedes-AMG GT3s.
Toksport Mercedes driver Luca Stolz ended up fourth with a 1m24.427s set early in the session.
Ricardo Feller was fastest in the Silver Cup class for the Emil Frey Lamborghini team.
The Swiss posted a 1m24.493s in his Lambo Huracan GT3 Evo, which was good enough for the class pole despite a late charge from CMR Bentley driver Pierre-Alexandre Jean
Raffaele Marciello, Boguslavskiy’s co-driver in the #88 ASP Merc, took the pole for the second of the two races.
The Italian went fastest with a 1m23.660s before a light rain shower brought the field into the pits.
Dries Vanthoor, who partners Weerts at WRT, returned to the track with just three minutes left on the clock and jumped to second with a 1m24.865s.
His time was beaten by Maro Engel, who went a tenth faster with a 1m23.751s in the Toksport Mercedes he shares with Stolz.
Jules Gounon took fourth position on the grid for race two in the second of the trio of ASP Mercs.
The Silver Cup pole for race two went to Toksport Mercedes driver Oscar Tunjo.
The Colombian’s 1m23.920s put him just over a tenth up on ASP driver Jim Pla.
The opening race on the penultimate weekend of the GTWC Sprint Cup starts at 11:00am local time on Sunday.