Iran canceled a London conference to promote new contracts for global oil companies, two weeks after economic sanctions were lifted, because the British government hasn’t been able to issue visas for Iranians to travel, an official told the weekly Iranian magazine Seda. The ministry spent the past two years working on a new model contract, in which fees paid to international companies will be linked to the oil price and determined on a sliding scale, with riskier developments paying more. The London event in late February was meant to woo foreign companies that were unable to attend a November 2015 conference in Tehran at which officials unveiled projects under the new terms. The U.K. government has issued visas “for a limited number of individuals,” Ali Kardor, deputy for investment and finance at the National Iranian Oil Company, said in a separate interview with the oil ministry’s news service, Shana. […]