place. 2011 Welsh devolution referendum: Voters in Wales approve plans to give the Welsh Assembly more powers. 9 March – The Serious Fraud Office arrests Robert and Vincent Tchenguiz in connection with the collapse of the Icelandic Kaupthing Bank. 11 March – Light aircraft carrier HMS Ark Royal (1981), flagship of the Royal Navy, is decommissioned, as part of the naval restructuring portion of the 2010 Strategic Defence and Security Review. 18 March – Former British Airways software engineer Rajib Karim, of Newcastle upon Tyne is jailed for 30 years after he was earlier convicted of plotting to blow up a plane. 19 March – Operation Unified Protector: British, French and American military initiate air strikes in Libya following United Nations Security Council Resolution 1973. 26 March – Hundreds of thousands of people march in London against government budget cuts, with the protests later turning violent. 27 March The 2011 United Kingdom census is conducted. A 47-year-old taxi driver, Christopher Halliwell, is charged with the murder of Sian O'Callaghan. 30 March – The landmark case of Jones v Kaney is decided in the Supreme Court: an expert witness can be sued for professional negligence. 31 March – is decommissioned in Belfast. April 1 April – The Daily Sport and Sunday Sport tabloid newspapers cease publication and enter administration. 3 April – The UK's last circus elephant is retired. 4 April – As part of the government's package of welfare reforms, the one-and-a-half million people in the UK who are claiming incapacity benefit begin to receive letters asking them to attend a work capability assessment. The tests are part of government plans to reduce the number of long-term claimants and will take until 2014 to complete. 5 April – Police investigating the murder of Sian O'Callaghan identify human remains found at a second site as those of Swindon woman Becky Godden-Edwards, who was last seen alive in 2002 at the age of 20. 6 April The mandatory retirement age begins to be phased out, and will be fully abolished by 1 October. The Competition Commission release their investigation order designed to prevent future mis-selling of payment protection insurance in the United Kingdom (PPI); most rules will come into force in October. 13 April – 53-year-old actor Brian Regan, most famous for his role as Terry Sullivan in the former Channel 4 TV soap Brookside, is charged – along with another man