In this Chapter—

• “consumer”—

  1. a

     in relation to the supply of water by a water undertaker to any premises, means a person who is for the time being the person on whom liability to pay charges to the undertaker in respect of that supply of water would fall, and

  2. b

     in relation to the provision of sewerage services in respect of any premises, means a person who is for the time being the person on whom liability to pay charges to the undertaker in respect of those services would fall;

• “trade effluent functions”, in relation to a sewerage undertaker, means its functions under Chapter III of Part VI.