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The figures given are for illustrative purposes only.
In order to recalculate you will need to enter representative values for items A, B, D and F below.
Values for A can be 'guesstimated' based on a trend analysis of historical data.
Values for B have already been pre-determined on a sliding scale until 2015 and F is linked to the Retail Price Index (RPI).
Which just leaves D as the most difficult number to predict. There are probably methods that could be used based on the monthly
OFGEM ROC reports and some ability to estimate the likely supply from new renewable energy projects.