Guardian: The insurance industry is forecasting a loss of up to $3.5bn (£2.4bn) from the growing oil spill in the Gulf of Mexico. This will be the biggest energy insurance loss in more than 20 years, and could drive up premiums. According to Lloyd’s of London insurer Catlin, the 20 April explosion, which triggered an undersea well leak, will be the biggest loss in the energy market since the explosion of the Piper Alpha platform in 1988. A spiral of reinsurance losses from that disaster cost …