The numbers presented here are the projected aggregate future cashflows under signed deals. The figures are in nominal terms, not today's money, and thus adding them together does not produce a meaningful figure. For the avoidance of doubt it would not be correct to refer to these projections as additional to Public Sector Net Debt (PSND), not least since many of these liabilities (where the relevant project is on the public sector's balance sheet) are already included within PSND.