In this article (HERE) Corbyn effectively says he's opposed to the EU because of rules preventing state aid. “There are also aspects of the single market one wants to think about such as the restrictions on state aid to industry, which is something that I would wish to challenge,” he says. This is the issue for the left. The right just want to scrap the bureaucracy, workers rights and environmental protection.
Neither side wants to address the real problems that bedevil us, of poor educational attainment, lack of skills, lack of investments in industry and infrastructure and so on. It's because they are difficult to resolve, coming as they do from attitude, something notoriously hard to change. They need cross party solutions and money over a sustained period. Both main political parties are looking for a quick fix solutions for the wrong problems. They are guilty of the same short term thinking that industry is usually accused of by the same politicians.
For the left it's only necessary to plough more money into industries that you have nationalised and therefore control in order to improve public services. On the right, they honestly think private industry is being held back by a lot of pettifogging regulations that are as unnecessary as they are burdensome.
But if we really tackled the underlying issues it wouldn't matter if the industries were state run or private. Running things efficiently for the public good shouldn't be a left/right matter at all, as it isn't in most of the EU. No wonder they listen to our leaders in bewilderment.