Tax no longer transferable so if you've just bought the car you won't get a V11 unless you've taxed it in your name. This was done to make catching uninsured drivers easier, since you can't tax it without insurance.
I got a v11 for the mini within about 5 days of buying it to remind me to make a SORN. With the Citroen I simply waiting for the v5c then taxed it with that.
Tax no longer transferable so if you've just bought the car you won't get a V11 unless you've taxed it in your name. This was done to make catching uninsured drivers easier, since you can't tax it without insurance.