After 21 Years, Total War: Warhammer Developers Are The Biggest Devs In UK Creative Assembly has a lot to celebrate today, with the launch of a brand new studio that makes it the largest UK games developer. Summon the Elector-Counts everyone, Creative Assembly has amassed enough people to become a faction unto themselves, according to a recent release from the popular UK Games studio. Creative Assembly, makers of Total War: Warhammer and the rest of the Total War series, are celebrating 21 years of Total War and a surprising amount of growth over the last year with the opening of a third studio.