The chief executive of one of Britain’s biggest energy suppliers has threatened to send investment overseas. Chief executive of Octopus Energy Greg Jackson has called on the UK government to overhaul its electricity grid as delays and planning hold-ups could force it to shift billions of pounds in investment elsewhere. He added that bureaucracy and red tape is holding British business back. Long delays in the time it takes to get connected to the National Grid mean Octopus is facing waits of more than a decade to develop some projects. Speaking to The Telegraph, the 52 year old said: “We have …