OK This seems to be the structure of the typical UK energy bill:
https://www.ofgem.gov.uk/ofgem-publi...uly2013web.pdf
Gas:
Wholesale: 67%
Distribution Costs: 16%
'Transmission' costs: 2%
VAT: 5%
Green Taxes: 6%
Other Costs: 4%
Electricity:
Wholesale: 58%
Distribution Costs: 16%
'Transmission' costs: 4%
VAT: 5%
Green Taxes: 11%
Other Costs: 5%
Some places seem to put 'Other Costs' (Ofgem describes this as the cost of electric meters, storage and so on) as a 'Green Tax' so that raises to 10% and 16% respectively or 15% and 21% if you wack VAT onto that as well but the actual green policies are included in the Green Tax figures (minus the poverty taxes as well).