Greg Jackson, who co-founded Octopus Energy in 2015, is thought to have stake in the company worth hundreds of millions of pounds - Hollie Adams/Reuters The entrepreneur behind Britain’s biggest energy supplier is sitting on a fortune worth £300m following the blockbuster sale of its technology arm. Greg Jackson, who co-founded Octopus Energy in 2015, secured the fortune after he confirmed late on Monday that the company’s Kraken software arm had been spun off as an independent business valued at $8.7bn ...