Royal Mail's stock market flotation could leave the Kuwaiti royal family with greater control over the business than the Queen, unions have warned.
Billy Hayes, leader of the Communication Workers Union, said that the news that Royal Mail's shares soared by 36% at the start of trading on Friday would not be met with "celebrations in delivery offices throughout the country".
"We have got Sovereign wealth funds [investing]. Kuwait has bought shares in Royal Mail, Singapore has bought shares. We're going to have a situation where the royal family in Kuwait has more influence over the postal service in the UK than the royal family in this country."
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The KIO, the City-based wing of the Gulf state's sovereign fund, is understood to have bid for millions of pounds in shares.
The Queen's head has been on stamps during her reign, with Royal Mail always seeking the monarch's permission to use their image on its stamps.
Vince Cable said most of the shares had gone to "long term investors" like pension funds and insurance companies.
The Lib Dem business secretary dismissed concerns expressed about the Kuwaiti royal family's influence over the Royal Mail as "completely meaningless", saying that the Kuwait Investment Authority was "a long term investment institution which is very active in the UK".
The Royal Mail's stock market entry comes as CWU union members are set to vote on strike action over pensions and working conditions next week.
Construction of The Shard was on the verge of cancellation until the Qatar invested £150m for an 80% stake.
They own a majority holding in Songbird Estates plc which has a very large investment in the Canary Wharf district.
QIA took over control of the village after the end of the 2012 Games.
The world's most expensive apartments are a joint venture between Sheikh Hamad bin Jassim bin Jaber Al Thani, the Qatari prime minister and minister of foreign affairs, and the Candy brothers.
The Qatari owners of the world's most renowned department store could afford to pay themselves a £100m last year.
Qatari investors have steadily upped there stake in Sainsbury's from 25% in 2007 to 29.9% today.
In an indication of how Qatari money underpins the UK financial system, they own 20% of the LSE
In a swing from the glamour of skyscrapers and luxury apartments, Qataris also own 20% of one of London's most popular open-air markets.