The British FV4034 Challenger 2 is the main battle tank currently in service with the United Kingdom. Built by the British company Alvis Vickers (now BAE Systems Land and Armaments). The manufacturer claims that it is the world's most reliable main battle tank. Challenger 2 is a complete redesign from Challenger 1, the MBT from which it was developed. Fewer than 5% of components are interchangeable, and the interior is reportedly totally different.
Challenger 2 entered service with the British Army in June 1998 and the last of the 386 tanks was delivered in April 2002. Challenger 2 has seen operational service in Bosnia and Kosovo. British Army Challenger 2 tanks were also deployed on active service in Operation Iraqi Freedom.
Challenger 2E, the latest development model, has been designed for the export market and is suitable for harsh environmental and climactic conditions. The 2E has been extensively trialled in Greece, Qatar and Saudi Arabia.
In July 2004, the UK Ministry of Defense announced plans for a reduction of seven Challenger 2 armored squadrons (about 100 tanks) by March 2007 and the change of role of one Challenger 2 regiment to an armored reconnaissance regiment. I do not know if they successfully did so or not. Does anyone else know?

