If you are a homeowner or shared owner, you can choose who you want to provide your gas, electricity, telephone line and internet if you pay the bills for them yourself. If they're included in your rent or service charges, then unfortunately you can't change them.
You must set up an account with the water provider in your area.
You can choose the companies that supply your home's gas, electricity, telephone line and internet connection.
If you live in a block with a communal heating and hot water system. Then you can't change your heating and hot water provider as the heating and hot water comes from a central energy plant.