11 June 2011 Last updated at 14:40 GMT By Ben Carter Reporter, Money Box

UK investors face losing 80% of their investments Bank of Ireland (BOI) could face a legal challenge from British investors who face losing 80% of their money.
Irish banks are under pressure from the state to raise capital, and bond holders are expected to "burden share".
One of the bond holders affected, Liberal Democrat MP, John Hemming, told BBC Radio 4's Money Box, it was unfair that smaller investors were worst hit.
BOI said that its offer to the holders of the permanent interest bearing shares complies with all requirements.
High returns
Money Box has been contacted by a number of concerned investors, who hold the bonds in question, first issued by Bristol and West in 1991.
The permanent interest bearing shares, or PIBS, were sold by a number of building societies at the time to boost capital.
The bonds pay 13.375% a year, which is a very high return now, but when the bonds were issued, interest rates were running in double figures.
In 1997, BOI took over Bristol and West, and in 2007 the bonds were officially transferred to the BOI UK branch.
Financial woes
Ireland's recent economic problems have resulted in the government insisting that banks shore up their capital positions.
BOI has been told it must raise 4.2bn euros in capital by a 31 July deadline, imposed by the state.
In order to raise the money, BOI announced an exchange offer, which would see most of the PIBS investors receiving 20p in the pound for their holding.
However, people with more than ?100,000 invested in the PIBS, are being offered 40% of the value of their bonds, if they accept new shares instead.
Ordinary investors suffer
In effect, this means the Irish government is getting preferential treatment, according to Mr Hemming, and small investors are being asked to sacrifice the most.
"A lot of small investors are losing out to protect the Irish tax payer," he told Money Box.
"The whole thing is likely to get tied up in a legal complication. There's a firm of solicitors, who are working on coming on board at the moment."

The offer to bond holders will worsen after 22 June.
Under a European Union directive, companies offering exchanges can either aim them at all investors, or deem them only suitable for larger investors.
Investors wanting to accept the deal face a tight deadline of 22 June, 2011.
Acceptance after this date will see the offer reduced to 16p cash, or 32% in shares, for every pound held.
If investors refuse to accept the offer, the Bank of Ireland will seek to redeem the bonds at 1p for every ?1,000 held.
The interests of the bond holders are not protected by the Financial Services Authority, and as a result people cannot claim for compensation through the Financial Services Compensation Scheme.
The BOI UK branch - which bought Bristol & West - falls under the Irish regulator. BOI UK, which was created last year and which operates Post Office accounts, is regulated by the FSA. This means that UK deposits up to ?85,000 in the Post Office are protected by the UK's financial compensation scheme.
BBC Radio 4's Money Box is broadcast on Saturdays at 1204 BST, and repeated on Sundays at 2100 BST.
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