Winters v Mishcon de Reya [2008] EWHC 2419 (Ch), [2008] All ER (D) 123 (Oct)
Where there is a joint retainer, or where the same solicitors act for two clients in related matters in which they have a common interest, neither client can claim legal professional privilege against the other in relation to documents which come into existence, or communications which pass between them and the solicitors, within the scope of the joint retainer or matter of common interest concerned.