David Cameron British Prime Minister David Cameron (L) greets the Emir of Qatar, Sheikh Hamad bin Khalifa al Thani at 10 Downing Street on October 26, 2010 in London, England. The Sheikh is on a two day State visit to the UK, the first since his last in 1985, which is seen as important in strengthening already strongly established business links with one of the Gulf States most financially powerful nations.