You're thinking of the 70 Series Land Cruiser, which is an older platform that Toyota still manufactures and offers around the world... in some markets.
TGS is merely a distributor and outfitter of Toyota vehicles for the UN, who famously uses the 70 Series Land Cruiser. But, TGS manufactures zero vehicles -- they simply outfit and work on vehicles that Toyota currently makes.
TGS does offer the Hilux as well, but only the current 8th gen model: https://www.toyota-gib.com/en/models/hilux.html
The Hilux in the above Top Gear video is a 4th generation model, which started production in 1983, and was last manufactured in 1997 when the final plant in South Africa stopped manufacturing it.