London shares are again on the up in early trade Friday, but only just, as investors hold on to their seats ahead of this weekend's crucial Greece referendum on European bailout proposals. The benchmark FTSE 100 index nudges 10 points, or about 0.15%, at 6,620, with Vodafone (VOD) and Standard Chartered (STAN) heading the Footsie leader board early on, posting 1.8% and 2% increases respectively. G