<Tr> <Td> British Gas </Td> <Td> 20 </Td> <Td> Residential and B2B </Td> <Td> Centrica </Td> <Td> UK </Td> <Td> Scottish Gas </Td> <Td> </Td> </Tr> <Tr> <Td> EDF Energy </Td> <Td> 5.8 </Td> <Td> Domestic </Td> <Td> EDF </Td> <Td> France </Td> <Td> </Td> <Td> SEEBOARD, SWEB energy & London Electricity </Td> </Tr> <Tr> <Td> E. ON UK </Td> <Td> 5.3 </Td> <Td> - </Td> <Td> E. ON </Td> <Td> Germany </Td> <Td> </Td> <Td> Powergen </Td> </Tr> <Tr> <Td> npower </Td> <Td> 6.5 </Td> <Td> Domestic and B2B (SME and I&C) </Td> <Td> innogy </Td> <Td> Germany </Td> <Td> </Td> <Td> Innogy, Northern Electric, Yorkshire Electricity </Td> </Tr>

How many energy customers are there in the uk