Selling a nationalised energy supplier, even one with 1.5 million customers, ought to be a simple process. First, you invite bids. Second, you assess the proposals, weighing them against criteria such as deliverability, value for money for taxpayers and likelihood of increasing competition. Third – and this is the critical bit – you explain your decision.With Bulb, even as a court on Wednesday approved the transfer to Octopus Energy, we’re still none the wiser about the main financial points. Octopus is said to be paying £100m to £200m but no...