Name the major Formula 1 Grand Prix circuit used in the UK.

The Silverstone circuit is the major Formula 1 Grand Prix track used in the UK. It has a rich history in motorsport, being one of the oldest tracks in the world to host Formula 1 races, having been part of the inaugural Formula 1 World Championship in 1950. The track has undergone various modifications over the years to enhance safety and improve the racing experience, but it remains a beloved location for fans and drivers alike. The circuit is known for its high-speed corners and challenging layout, making it a favorite among many F1 competitors.

In contrast, Brands Hatch, while also a notable motorsport venue in the UK, is not currently used for Formula 1 events. Circuit de Spa-Francorchamps and Monza are famous tracks, but they are located in Belgium and Italy, respectively, and do not pertain to circuits in the UK. Thus, the Silverstone circuit is clearly established as the primary venue for the UK Grand Prix in the context of Formula 1.