If my housemate doesn't pay their fair share of the bills, what happens?

If you pay us on time but any other tenant doesn't pay us, we will chase that tenant, and not you, for their outstanding share of the bills. However when your account is closed (for example, at the end of your tenancy), then we may use any tenants' deposit or any tenants' credit balance against any other tenants' debt. We will never chase you to pay any other tenants' debt.