Maybe the Cardiff Torchwood was established as the second as perhaps the Torchwood estate in Scotland would have been too far away from the seat of Goverment.
Cardiff would have been a good location as it was closer to the capital and safer in case of invasion, as the enemy would head for London first. The London Torchwood perhaps was the third, 1.Being the estate 2.Cardiff say a bit before WWI 3.Canary Warf in the ninties as it was built all state of the art new headquarters leaving Cardiff to be the backup team. Glasgow I havnt a clue where they fit in.
