Procter & Gamble might be left with an awkward core of minority shareholders that could complicate its plans to integrate its biggest acquisition, Wella, the German hair care group.P&G received a boost late on Friday when Henkel, the German consumer group, said it had agreed to sell its holding of Wella ordinary and preference shares, totalling about 7% of the total share capital, to P&G. But Close Brothers, a UK investment bank, warned that a group of Wella preference shareholder...