Premier Oil shares jumped 13% in mid-morning London trade after reaching a deal to buy the assets in the central U.K. North Sea from BP in a $625 million deal as well as a 25% stake in the Tolmount area it operates from Korea National Oil Corp.'s Dana Petroleum for $191 million. Premier Oil said the assets will generate over $1 billion in free cash flow by the end of 2023 and add 82 mmboe of reserves and contingent resources at an implied cost of less than $10 per barrel of oil equivalent.