The figure the Times (Murdoch, so if anything the figure's exaggerated) gives is only 8%
http://www.timesonline.co.uk/tol/money/pensions/article7148161.eceMost pension funds tend to have about 8 per cent of their UK equity holdings in BP because until recently it represented about 8 per cent of the FTSE 100 index of leading shares.
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I know my pension fund holds BP shares. Will I have suffered a drop in the value of my pension pot?
You could have suffered from a fall in the value of your pension pot if it held a substantial chunk of BP shares. However, the impact of any fall in BP shares will be diluted by a number of factors.
First, even if your pension fund had 8 per cent of its UK shareholdings in BP, that still leaves 92 per cent in other stocks. Second, pension funds invest not only in the UK stock market but also in Europe, the United States and the rest of the world, adding an extra element of dilution. Finally, pension funds normally have holdings in other assets, such as bonds, property and cash, thus ensuring that no one single investment can have too much of an effect on the fund’s overall performance.
The tabloid press:
has been hyping this up into a much larger threat than it actually is, because it sells papers (foreigners taking our stuff!) and pleases the owners' billionaire friends. So a slight downturn in pension values becomes "OBAMA IS KILLING ALL OUR PENSIONS"