Oh dear, here we go again. Lack of info makes everyone look stupid.
As has rightly been pointed out, there ARE leader lines on the track data blocks if they are positioned far away enough from the radar return.
Following previous problems with misidentification, it is now accepted practice that if the TDBs are to be moved, they must be moved to a point where the leader line can be seen clearly.
The only thing the new software drop does is giv 360 degree movement of the TDBs with leaders appearing at each setting.
The controller in question at Swanwick was not adhering to accepted practice of moving TDBs, and guess what happens!