The FTSE 100 is already down 111.8 points, or 1.83%, to 6,004.4, as commodity stocks continue to pull the index lower.
Recent volatility in global stock markets, which has seen the FTSE 100 fall 4.4% in three days, has caused UK pension deficits to rise by £11bn, claims Aon Consulting.
The FTSE 100 has ended the session down another 114.6 points, or 1.82%, to 6,171.5, as a recovery on Wall Street failed to boost the index.
The FTSE 100 has ended the day up 33.2 points, or 0.52%, to 6,434.7, as the index just fell short of a new six-year high following a series of positive results.
The FTSE 100 is up 37.6 points, or 0.59%, to 6,439.1 in early trading, following positive trading statements from Persimmon and AB Foods.
London's leading shares opened fairly high, despite the effect of a weaker mining sector, as bullish banks secured early gains.
The FTSE 100 has ended the day down 32.1 points, or 0.5%, to 6,412.3, as poor results news from drinks companies and a bad start to Wall Street failed to rally the index.
The FTSE 100 index is down 7.8 points, or 0.12%, to 6,436.6 in early trading, as results data is overshadowing some positive broker notes.
The FTSE 100 index rose 24.9 points, or 0.4%, to 6,444 points today - a fresh six-year high - as mining stocks gained on the back of rising metal prices.
The FTSE 100 index has ended the day down 13.8 points, or 0.21%, to 6,419.5, as there are now fears China may reduce demand for commodities and affect the revenue potential of mining firms.