At the time the first waste deal was signed in 2000, Matheson, then Matheson Ormsby Prentice or MOPs, was a significant corporate law firm but not the docklands legal giant, famed for its international tax practice, it would become.  The firm was acting for Micheal Noble of Noble Waste Disposal, a company being acquired by Celtic Waste. As part of the transaction, Noble entered into an option agreement allowing Celtic acquire a landfill site at Ballynagran, County Wicklow for €3.25 million. If exercised, the option provided that once certain targets were met, Celtic would pay Noble annual royalty payments, amounting to…