By Andy Silvester Another building project, another planning delay. It is as predictable as rain on a bank holiday. And it does the same thing to the mood of investors. London needs to build. The UK needs to build. It also needs to repurpose buildings, find new ways of linking up communities, and generally put the bricks and mortar in place for a growing population of worker bees. That growing working population, lest us forget, is the only way we are going to keep this free-spending house of cards on the road. The Barbican decision may or may not be procedural, depending on who you ask. But i…