i also forgot to mention that the CEO of dla piper (which is the largest law firm (in terms of lawyers) in the world with origins in sheffield itself) also studied the LLB at sheff (nigel knowles), not that this is important just thought i should add this.
EDIT: also looking through firms' websites, thelawyer2b magazine+website i don't come across much (if any) newcastle law affiliated persons/trainees/partners etc - though this may be different when working in a law firm on a vac scheme/actual training as the odd newcastle grad etc may pop up in person