Charlie Davies-Gilbert sponsored AlisterScott for 140 mile Coast-to-Coast run-bike-canoe by doing Clean your bills over two months.
Here are the details of their pledge:
What kind of electricity supplier do you use at the moment?
A great green tariff
How many people live in your house? (or occupy the building whose supply you’re switching)
Are electric heaters your main source of warmth? (As opposed to boilers run on gas or oil)
I don't know