By Russell Myers Prince William is set to launch a 2,500-home “garden city” to tackle the social housing crisis. The project, through the Duchy of Cornwall, will create hundreds of affordable houses on his farmland. A total of 30% are for low-income households, three times more than rules for new projects. The 320-acre plan in Faversham, Kent, will create jobs and includes a primary school and shops. Officials are understood to be in the final stages of signing off the application lodged with Swale Borough council, before publishing a decision by January 31. But Tory MP Helen Whately said the …