Stock markets suffered another torrid day as traders on both sides of the Atlantic dumped shares on rumours of a downgrade of France’s credit rating and growing concerns over the eurozone economies. Asian markets were also down this morning, although they clawed back some of their losses later in the trading session. Japan's Nikkei slid 0.6pc, after falling as much as 2.3pc, while the Hang Seng fell 1.2pc in Hong Kong, after losing 2.6pc earlier in the day. Last night, a 3pc decline in the FTSE 100, down 157.76 to 5007.16, knocked £41bn off the blue-chip index. It has now...