Stock markets in Britain and the US have once again hit record highs this week, but experts have warned this could be the calm before a crushing storm.Britain’s FTSE 100 has now rocketed by a whopping 20 percent over the last year, hitting new top levels of 7,598 again today.  At the same time, America’s Dow Jones, S&P500 and Nasdaq have seen large gains

and hit fresh records this week.  But there are signs that these highs could be about to be reversed.Stock markets tend to be more volatile in the summer months in part due to lower volume levels, which can mean losses for investors.  June is the worst month for returns from the UK FTSE-All Share market and is the only month of the year to see more losses than gains over the last 30 years, according to an analysis by Hargreaves Lansdown.  READ MORE