From what I've seen they recruit fully from their TC. This is probably changing this year since the vac scheme opens in Feb but with the vac scheme they did in September, I was told that you'd still have to apply for their TC.
That being said, can anyone help me out with "why DACB?" I had applied for the TC on a whim and luckily got through to the VI, but as I'm looking at their top practice areas (in London), I'm not sure it's what I want to do. I had applied for the Bristol office for their vac scheme because their real estate team is bigger. But they only sponsor in the London office so I need to plan an answer to why I applied to that office in particular as well.