Don't think they allow that now pipme, since the new style documents came out you need the green, proof of ownership portion, of the form which enables you tax the car.
This new method was a security change to stop people ringing cars, as we explained at the time. Unfortunately you are now going to have to go through whatever procedures DVLA have in place, their wheels are bound to move at an almost standstill, so you will have to be patient. You don't have a hope in hells chance of suing a Gov agency on something as flimsy as this.
Ian, we have spoken about this before if I remember correctly, they recently bought the car and his father failed to remove the V5/2 portion of the form, then sent it back to Swansea complete.