Andy Burnham has written an open letter to people in Stockport making the case for the region’s controversial long-term development plan.The joint letter with Stockport council leader Elise Wilson says that more of the borough’s green belt will be put at risk outside the Greater Manchester Spatial Framework (GMSF), than within it.However opponents of the scheme - including many of the ‘Save the Greenbelt’ groups - remain unconvinced.It comes after Stockport councillors last week voted to