To find out who supplies your electricity you'll need to call your local distribution company. The number you need to call depends on where your new building is:
Northern Scotland - 0800 048 3515
Central and Southern Scotland - 0330 101 0300
North West England - 0800 195 4141
North East England - 0845 070 7172
Merseyside and North Wales - 0330 101 0300
South Wales, Midlands and South West England - 0845 601 5972
London, East and South East - 0845 601 4516
South England - 0845 026 2554