As noted above, the costs and scheduling of projects have historically evolved over time. It is therefore reasonable to expect that (for whatever reason) the outturn future spend on projects will not be exactly as planned in the current EPP. Considering the shape of the actual EPP169, if the historically observed cost overruns and/or delays are to be expected in the current projects, then it is possible to estimate what the actual expenditure will be based on the current programme.
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169 At the time of writing only the annual totals in EPP09 post-equipment exam/post-options were available. The detailed breakdown from the pre-equipment exam / pre-options (stage 3b) has been applied to the total as an estimate.