BCA(£) = Gross Buy Price Cost Adjustment (Energy)
BVA(MWh) = Gross Buy Price Volume Adjustment (Energy)
SCA(£) = Gross Sell Price Cost Adjustment (Energy)
SVA(MWh) = Gross Sell Price Volume Adjustment (Energy)
BSA(MWh) = Gross Buy Price Volume Adjustment (System)
SSA(MWh) = Gross Sell Price Volume Adjustment (System)