Direct proof of use
Public-domain U.S. military image records directly document FV432 armored personnel carriers with British units during Operation Desert Shield and Operation Desert Storm. A 28 February 1991 image caption identifies an FV432 of the 7th Brigade Royal Scots, 1st United Kingdom Armored Division, crossing from southern Iraq into Kuwait during Operation Desert Storm.
Related Desert Storm imagery places FV432s with the same British formation in operational movement and medical-support settings. One image describes FV432 armored personnel carriers passing a burning Iraqi anti-tank vehicle while advancing east into Kuwait; another identifies medical vehicles of the 7th Brigade Royal Scots positioned north of the Saudi-Iraq border, with a British FV432 in the foreground.
Sources: Wikimedia FV432 Royal Scots, GetArchive FV432 Advancing East, PICRYL Medical FV432
British formation context
The National Army Museum describes the Gulf War as the British Army's largest single deployment since the Second World War and states that the British Army contribution to the coalition was based on 1st Armoured Division. It lists about 35,000 British personnel and 13,000 vehicles in the campaign against Iraq.
A Royal Scots account of the battalion in the Gulf campaign describes the unit as an armoured infantry battalion in 1st (UK) Division. It says the battalion's Milan anti-tank platoon, 81 mm mortar section, main-headquarters vehicles, and ambulances were mounted on FV432s, which explains why the vehicle appears in both movement and support imagery rather than only as a troop carrier.
Sources: National Army Museum Gulf War, Royal Scots Last Battle Honour
Timeline
The dated record begins before the coalition ground offensive. On 6 January 1991, a U.S. Army history image identified an FV432-series armored personnel carrier with Company C, 1st Battalion, The Staffordshire Regiment, 1st United Kingdom Armoured Division, during a live-fire training exercise in Operation Desert Shield.
On 28 February 1991, the final day of the war's ground campaign, U.S. military image records identified FV432s with the 7th Brigade Royal Scots as they crossed or advanced into Kuwait from southern Iraq during Operation Desert Storm.
Sources: Wikimedia FV432 Desert Shield Training, Wikimedia FV432 Royal Scots, GetArchive FV432 Advancing East
Narrative
In the 1990 Gulf War, the FV432 appears in the source record as a British tracked armored personnel carrier and support-vehicle hull within the coalition ground force. The strongest direct evidence is photographic: the vehicle is shown in January 1991 training with a British infantry battalion and in February 1991 Desert Storm movement with the 7th Brigade Royal Scots.
The sources support armored mobility, support, command, mortar, anti-tank-platoon carriage, and medical-vehicle roles for the FV432 in the British contingent. They do not by themselves establish a specific FV432 firing incident, casualty event, or battle-damage result, so the documented role is best stated as coalition armored mobility and protected support during the ground campaign.
Sources: Wikimedia FV432 Desert Shield Training, Wikimedia FV432 Royal Scots, GetArchive FV432 Advancing East, PICRYL Medical FV432, Royal Scots Last Battle Honour