Direct proof of use
The Hunt class is documented in the 1990 Gulf War through HMS Brocklesby, HMS Brecon, and HMS Bicester. Royal Navy Navy News reported in August 1992 that the three mine countermeasures vessels arrived in Gulf waters soon after the end of hostilities in 1991 and were tasked with clearing shipping routes from the Northern Gulf to Kuwaiti ports.
The same report says that after initial channels were complete, the ships moved deeper into mixed ground and buoyant minefields laid by Iraqi forces. Navy News credited the three ships with accounting for 164 mines during the operation.
Sources: Navy News August 1992 Gulf mine clearance report
Timeline
The documented Hunt-class work followed the February 28, 1991 end of major combat operations. Navy News described Brocklesby, Brecon, and Bicester arriving in Gulf waters soon afterward, then clearing initial channels and moving into larger minefields.
The mine-clearance work was part of the postwar maritime task of making Kuwaiti port approaches usable again. The source ties the Hunt-class vessels to route clearance, mine disposal, and coalition-side maritime access rather than to offensive fire support.
Sources: Navy News August 1992 Gulf mine clearance report
Operational role
Hunt-class use in the Gulf War record centers on mine countermeasures. The modern Royal Navy class page describes Hunt-class ships as mine countermeasure vessels that use high-definition sonar, clearance diving teams, and the SeaFox mine disposal system to find and destroy mines and lost explosives.
In the 1991 Gulf setting, Navy News places named Hunt-class hulls in the Northern Gulf and Kuwaiti port approaches, where their job was to reopen shipping routes after Iraqi mine-laying. The available direct source does not describe the ships striking targets; it documents maritime route clearance and mine disposal in polluted, mined waters.
Sources: Hunt Class Mine Countermeasures Vessel | Royal Navy, Navy News August 1992 Gulf mine clearance report