The decision to allow the Orange Order the right to walk down the Garvaghy Road in Portadown in the north of Ireland this weekend is the most destabilising decision to have happened here since the Good Friday Agreement. Nearly three decades after that agreement nationalists all across the north are in real fear that this march will open up a conflict around the march that took the lives of 21 Catholics in the 1990s.  Thousands are now gathered to oppose an Orange Order march through the predominantly nationalist area.