| October 2002 | Open consultation on 'Ofwat's approach to the periodic review 2004' and supporting information requirements |
| November 2002 | Market Research Stage 1 – Report published |
| December 2002 | Receive initial guidance from Ministers on two scenarios for environmental and water quality improvement and guidance on social issues |
| January 2003 | Consultation period ends |
| Quarter 3 | Consult on cost base information requirements |
| March 2003 | Publish decisions on Ofwat's approach to the periodic review 2004 |
| March 2003 | Issue information reporting requirements for the draft business plan |
| May 2003 | - Release update of financial model.
- Issue draft business plan ICS.
- Publish initial feedback on cost base submissions so that companies are aware of their comparative costs when they produce their draft business plans.
- Confirm reference assumptions.
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