October is always a turbulent month, and I’m feeling uneasy about this one. The FTSE100 index, which looked set to break through 7,000 in September, has lost more than 500 points since then — and would have lost more but for manoeuvres in the mining sector. Pessimism stalks the bond markets, and even a falling oil price is read more as a harbinger of faltering growth than a stimulus for further recovery.