In addition to the APC role, it has been used as a resupply vehicle for the FV102 Striker, carrying extra Swingfire missiles.

The FV120 has a two-man turret, and carries thirteen MILAN Anti-Tank Light Infantry Missiles, with two in launch positions.

[7] CVR(T) prototype number 11 (a Scorpion) was cut and extended to demonstrate the basic hull could be used as a ten-man Armoured Personnel Carrier (APC), and a diesel engine fitted.

After tests confirmed the stretched version retained the mobility of the basic CVR(T), MVEE built another prototype from scratch with a wider hull[8] called the FV4333.

In 2006 it was reported to the House of Commons that 478 FV103 vehicles were in service with the armed forces of the United Kingdom in April of that year, 452 of them in a deployable state.

[12] On 11 April 2022, during the 2022 Russian invasion of Ukraine, the United Kingdom approved the delivery of 120 armored vehicles, including FV103 Spartan combat vehicles, to Ukraine following a meeting between UK prime minister Boris Johnson and Ukrainian president Volodymyr Zelensky in an unannounced visit to Kyiv.

[14] A crowdfunding appeal by the Prytula Foundation launched on 2 November 2022 raised US$5.5m to buy 60 ex-British Army FV103 Spartans, to be delivered to Ukraine that year.