Virtual Worlds Research has been using Ada to build large scale economic simulations for 10 years now. These simulations have been used by Governments and others to model the effects of, amongst other things, changing Legal Aid and reforming Social Care funding - many billions of pounds of annual spending. Here, I discuss our experiences, good and bad, with the Ada language, and provide a live demonstration of the most recent model. I'll also discuss work in progress to build a new forecasting model in association with the University of Southampton.