From the File, hope this is of info
Series 5 was introduced around 1986, based on a 110in coil - sprung defender chassis. 4 versions were avaiable, s.51 standard car, s.52 turreted, s.55 un turreted, and s.53 air defence, which monted either 2 blowpipe or javelin surface to air missiles, not bad for a Land Rover.
Series 5 had power steering ( thank god ) improved suspension, tighter turning circle, and a top speed of 121kph. Optional extras, included run flat tyres, machine gun hatch in the s.55 armoured glass and a PA system.
At the end of the production run for the Series 5, this Land Rover type was in service with more than 38 countries ( the nearest to Oz were Thailand, Malaysia )

