Here is what you need to know at the London market open: FTSE 100: called up 7.8 points, 0.1%, at 8,826.23 Hang Seng: down 1.2% at 23,698.78 Nikkei 225: up 0.8% at 38,838.57 S&P/ASX 200: down 0.2% at ...