By Ashley Cowburn Keir Starmer is expected to abandon his flagship pledge to invest £28 billion a year on green energy projects in a major U-turn. First unveiled by Shadow Chancellor Rachel Reeves at the party’s annual conference in 2021, it was hailed by environmental campaigners. But it was watered down last year as the party said the £28billion target would likely be met in the second half of a first Labour term in power – rather than immediately. After weeks of internal wobbling over the policy that has been at the centre of Tory attacks Labour is expected to officially drop the multi-bill…