What is the largest aircraft museum in the UK?

IWM Duxford is Britain's largest aviation museum, and it is also described as Europe's largest flying museum. The museum houses nearly 200 aircraft, military vehicles, artillery and small naval vessels in seven main exhibition buildings. With over 200 aircraft on display, Duxford has expanded to become one of the largest aviation museums in Europe. The museum's size and scope is impressive, featuring enormous hangars, gigantic aircraft, and multiple exhibitions covering everything from WWI aircraft to Cold War jets. The site occupies a significant area, originally planned as a 238-acre site, though construction of the M11 in 1977 forced some modifications. The museum attracts over 350,000 visitors annually and offers an unparalleled collection spanning the complete history of aviation. Duxford also maintains an active airfield with two parallel runways, making it unique among aviation museums as a living, working airfield where historic aircraft still fly.