"What the big, fat, inefficient energy companies are hoping (and, yes, I am thinking about British Gas) is that most customers are too trusting, timid, lazy or uniformed about how easy it is, to bother changing their provider." Colwyn.
Thanks Colwyn and same also applies to mortgages - people sometimes spend hundreds more a month than they need to often because they don't realise they can simply change their mortgage provider or even change to a new deal with an existing one.