A report by the National Audit Office today said English Partnerships, the Government's agency for regeneration, would struggle to meet its target of constructing 4,250 houses by 2016 in the area around the former Millennium Dome, which is now known as the O2 arena. Under the terms of the development, drawn up in 1997 when the Government spent more than £225million on securing the peninsula for redevelopment, a share of profits made on the 170-acre site would be returned to the public purse.