These were the Chieftain Mk5(P)- FV4030/1, FV4030/2 Shir (Lion) /3 Shir 2.

The Challenger design by the former Military Vehicles and Engineering Establishment (MVEE) near Chobham in Surrey originated in an Iranian order for an improved version of the Chieftain line of tanks in service around the world. Challenger 1 of the 1st The Queen's Dragoon Guards with IFOR markings. This vehicle was used for suspension testing. History Challenger 1 on display at The Tank Museum, Bovington. The Jordanian Challenger 1 fleet had been retired by January 2023. Known locally as Al-Hussein, these vehicles received various Jordanian modifications before being replaced by French-made Leclerc tanks from the UAE and ex-Italian B1 Centauro 8x8 wheeled tank destroyers. The majority of the Challenger 1 fleet was subsequently sold to Jordan where it remained in service with the Royal Jordanian Army until withdrawals were announced in 2018.

The FV4030/4 Challenger 1 is a British main battle tank (MBT) used by the British Army from 1983 to 2001, when it was superseded by the Challenger 2.

British new main battle tank