With Mickey Clarke and Jeremy Naylor. The oil producers' cartel OPEC is 50 years old. We talk to Dr Leo Drollas, chief economist and deputy director of the Centre for Global Energy Studies, and author of The Devil's Gold, a book about OPEC. The consultation period on removing the requirement to buy a pension annuity by the age of 75 is ending. Malcolm McLean, a pensions expert at the consultancy Barnett Waddingham, tells us why the government has come under pressure to make changes. Key players in the construction industry are calling on the government to bring in more incentives to tackle CO2 emissions in the property sector. We talk to David Johnston, lawyer from Berwin Leighton Paisner and author of a report into this. The think-tank the Institute of Public Policy Research says as much as £100m could be generated by community buildings if they were to use solar panels. We ask Reg Platt, a researcher at the IPPR, which buildings have the most potential.