"For the good of the what?"
"The British Empire."
"There isn't a British Empire."
The British Empire was the governing body of several territories and colonies on Earth from the 15th Century and into the 20th Century. It spanned across the Earth as did the Roman Empire and the New Roman Empire.
The Empire's territory was made of islands, colonies, and any piece of land belonging to it. The territories were...
Set up in 1879, the Torchwood Institute is an agency whose purpose is to protect the British Empire from otherworldly invaders. It has done so till this day, shooting down any spacecraft that enter the Earth space. They have continued to create technology that is advanced for this time(having Particle Guns when they shouldn't).
Torchwood also created the weapon that destroyed the Sycorax Asteroid Ship on Christmas Day in 2006. One of the Institute's branches, Torchwood One, was run by Yvonne Hartman out of the Torchwood Tower, also called Canary Wharf. She believed that Britain would someday become an Empire once more.