THE taxpayers' bill for the Dome could rise by a further £40m, it emerged today, as the mystery grew over the real level of debt surrounding the troubled east London attraction. The Greenwich site, which has consumed £628m of Lottery money and a further £200m - originally earmarked for good causes - to keep it afloat, is due to be handed over to property developers for nothing. The Government will then take a share of future profits as the land surrounding the Dome is sold over the next 25 years.