Following World War I, many experiments involving armoured vehicles were conducted in Britain. The most significant advances were made in the areas of suspensions, tracks, communications, and the organization of these vehicles on the battlefield. British designs, particularly those from Vickers-Armstrong, formed the basis for many of the most common tanks of the 1930s and early World War II. For example, the Vickers Six Ton Tank was the basis for the Polish 7TP, the Soviet T-26, and was a major influence on the Italian M-11 and M-13 series and the Czech LT-35. The six-ton Vickers tank was not adopted by the British Army.