Question: Challenger 1 was superseded by a battle tank designed and built by which company ?
Context: The TR-85 is a main battle tank designed for the armed forces of Romania.  Based on the TR-77-580 (Romanian-built version of the Soviet T-55 tank), the TR-85 tank was developed from 1978 to 1985 and produced from 1986 until 1990.  A modernization program was initiated in March 1994 in order to upgrade the TR-85 tanks to NATO standards.  The result was the TR-85M1 main battle tank, currently the most modern tank in service with the Romanian Land Forces.  Although a further development of the T-55, the TR-85M1 uses a T-block powerpack (similar to the one used in the Leopard 1) based on a V8 German 830 hp diesel engine, an improved turret, a locally-designed "Ciclop" fire control system (with cross-wind sensor, laser rangefinder and night vision), new 100 mm BM-412 Sg APFSDS-T projectiles and a completely redesigned suspension with 6 road wheels on each side, protected by metal side skirts.  Combat weight is 50 tons. The Leopard (or Leopard 1) is a main battle tank designed and produced in West Germany that first entered service in 1965.  Developed in an era when HEAT warheads were thought to make conventional heavy armour of limited value, the Leopard focused on firepower in the form of the German-built version of the British L7 105-mm gun, and improved cross-country performance that was unmatched by other designs of the era. The AMX 50 (official designation) or AMX-50 was a French heavy tank designed in the immediate post Second World War period.  It was proposed as, in succession, the French medium, heavy, and main battle tank and incorporated many advanced features.  However, it was to suffer cancellation in the late 1950s due to unfavourable economic and political circumstances combined with delays in development. The Bernardini MB-3 Tamoyo was a Brazilian main battle tank designed by Bernardini; however, it never reached production status and it never passed beyond the prototype stage (1983).  It was followed by the EE-T1 Osório in 1984, the EE-T2 Osório in 1985, and the Tamoyo III in 1987.  The tank was armed with a 90mm gun and carried 68 rounds of ammunition. The FV4601 MBT-80 was a British experimental third-generation main battle tank, designed in the late 1970s to replace the Chieftain tank.  It was eventually (and later controversially) cancelled in favour of the Challenger 1, itself an evolution of the Chieftain design. The FV4030/4 Challenger 1 is a British main battle tank (MBT) used by the British Army from 1983 to the mid-1990s, when it was superseded by the Challenger 2.  It is also currently used by the Royal Jordanian Army as its main battle tank after heavy modifications.  The variants for the Jordanian military are to be upgraded using the unmanned Falcon turret. The Ramses II tank is a heavily modernized T-55 main battle tank designed for and used by the Egyptian Armed Forces.  A single T-54 was sent to the United States for upgrading.  A primary prototype was sent to Egypt where extensive trials were completed in late 1987.  The tank finally entered production in 2004–2005.  A total of 425 units have been produced.  The tank was originally called the T-54E ("E" stands for "Egyptian"). The FV4034 Challenger 2 is a British main battle tank (MBT) in service with the armies of the United Kingdom and Oman.  It was designed and built by the British company Vickers Defence Systems (now known as BAE Systems Land & Armaments). The AMX-30 is a main battle tank designed by Ateliers de construction d'Issy-les-Moulineaux (AMX, then GIAT) and first delivered to the French Army in 1966.  The first five tanks were issued to the 501st "Régiment de Chars de Combat" (Tank Regiment) in August of that year.  The production version of the AMX-30 weighed 36 MT , and sacrificed protection for increased mobility.  The French believed that it would have required too much armour to protect against the latest anti-tank threats, thereby reducing the tank's maneuverability.  Protection, instead, was provided by the speed and the compact dimensions of the vehicle, including a height of 2.28 metres.  It had a 105 mm gun, firing a then advanced high explosive anti-tank warhead known as the "Obus G".  The "Obus G" used an outer shell, separated from the main charge by ball bearings, to allow the round to be spin stabilized by the gun without affecting the warhead inside.  Mobility was provided by the 720 hp HS-110 diesel engine, although the troublesome transmission adversely affected the tank's performance. A main battle tank (MBT), also known as a battle tank or universal tank, is a tank that fills the armor-protected direct fire and maneuver role of many modern armies.  Cold War-era development of more powerful engines, better suspension systems and lightweight composite armour allowed a tank to have the firepower of a super-heavy tank, armor protection of a heavy tank, and mobility of a light tank all in a package with the weight of a medium tank.  Through the 1960s, the MBT replaced almost all other tanks, leaving only some specialist roles to be filled by lighter designs or other types of armoured fighting vehicles.
Answer: Vickers Defence Systems