The Water Supply and Sewerage Services (Customer Service Standards) Regulations 1989,S. I. 1989/1159,The whole,
The Water Supply and Sewerage Services (Customer Service Standards) (Amendment) Regulations 1989,S. I. 1989/1383,The whole,
The Water Supply and Sewerage Services (Customer Service Standards) (Amendment) Regulations 1993,S. I. 1993/500,The whole,
The Water Supply and Sewerage Services (Customer Service Standards) (Amendment) Regulations 1996,S. I. 1996/3065,The whole,
The Water Supply and Sewerage Services (Customer Service Standards) (Amendment) Regulations 2000,S. I. 2000/2301,The whole,