2 Experimental Vehicle FV4202 also known as the 40-ton Centurion[1] was a technology test bed developed by British company Leyland Motors between 1955 and 1956.

The FV4202 was built by Leyland Motors as a research vehicle for the FVRDE to test the conceptual layout of the proposed FV4201 Chieftain main battle tank.

[4] The FV4202 test bed was built from readily available Centurion parts, such as the suspensions, smoke grenade dischargers, armament, hatches, cupola, sights and turret drive.

It featured a reclined driver position, allowing the use of a well-sloped glacis plate and the "mantletless" cast turret was built, with an internal gun mantlet.

The engine was coupled to a Merritt-Brown V52 gearbox originally developed for the Vickers Medium Cruiser Tank Mk.