As an M60A1 tank gunner stationed in Germany circa 1967-8 until my opportunity for an all-expense paid tour of the spas and resorts of exotic Southeast Asia came along just in time for me to attend the natives' quaint Tet '68 welcoming ceremony and fireworks, I can assure you that though the T62 and T64 were well known to us- I can tell you to this day the exact airing point for taking one out with a tank's main gun HEAT round- the T54/T55 was still the mainstay of the Soviet Bloc tank fleet, with over 50,000 in service, making it the most-produced tank of all time, even edging out the wartime T34 and M4 Sherman series. The Soviet doctrine of the time was that *quantity has a quality of its own... and there was at least some truth to that; we'd have had the defensive advantage of going to work with full fuel tanks, but having literally dozens of targets to clean up requires dozens of rounds of main gun ammo, and carry of more than about three dozen could be hazardous in the extreme. But having later crewed in a T55L myself, I can tell you that they're preferable to the T64, unless you're the driver and are under about 5'3" tall....
I expect the vehicles used against the Iraqi armour were a Squadron of the Regiment's 58 Challenger II main battle tanks, but the description of *light tanks* suggests a cavalry screening recce element of Warrior mechanised infantry combat vehicles, roughly the Brit equivalent of the M2/M3 Bradley Infantry vehicle got in those; a troop-carrier but one with a very accurate gun and a ATGM missile capability for anything too gun-resistant.
The Queens Dragoon Guards tank gunnery standards are quite high and their modernized armour has the full range of thermal viewing and laser rangefinding fire control for their 120mm L30 main gun, making a tank-versus-tank shootout between T55s and Challengers likely to resemble a turkey shoot.
And that's not at all the only mischief the 7th Brigade's *Desert Rats* have been up to lately. It seems they've been about nicking portraits of Saddam. Should look dandy in the Regimental Mess at Edinburgh Castle....