Our Business Plan 2020-25 has been produced to be concise, clear and sufficiently detailed in all aspects, but by the very nature of its complexity, requires a lot of supporting evidence to be robust and fully detailed. This further level of evidence and detail is provided in the form of a number of supporting appendices and data tables.

Recognising that it is not in the best interest of our customers or the wider public interest to make all of the contents of these supporting documents public, we have, in the versions of some of the supporting documents published here, made a small number of redactions of information that is either confidential, commercially sensitive, and/or otherwise identified as sensitive for reasons of national security and the requirements of the Security and Emergency Measures (Licensed Water Suppliers) Direction.

TA.0.1 Navigating our Plan
TA.2.1 Statements of Board Assurance
TA.2.2 Board engagement and challenge
TA.2.3 PR19 Assurance Framework
TA.2.4 Trust and transparency YouGov full report
TA.2.4 Trust and transparency
TA.2.5 Meeting our Statutory and Licence obligations
TA.2.6 Legal Instruments (WINEP and DWI Notices)
TA.2.7 Letters of Assurance
TA.4.1 Customer engagement methodology and findings
TA.4.2 Summary of supporting customer insight
TA.4.3 Triangulation of customer priorities
TA.4.4 Customer and Stakeholder engagement deliverables
TA.4.5 CCG Challenge Log
TA.5.1 Future Customer Engagement & Participation principles
TA.5.2 Future Customer Engagement & Participation Examples
TA.5.3 Future Customer Engagement Strategy (CCG - June '18)
TA.6.1 Our approach to PCs and ODIs
TA.6.2 Our package of PCs and ODIs
TA.6.3 Rationale for AMP6 amendments and discontinuations
TA.7.1 Understanding Operational risk and resilience
TA.7.2 Corporate risks: Ethical business practices and modern compliance framework
TA.7.3 Understanding risks: High level risk summary table
TA.7.4 Demonstrating our Resilience
TA.7.5 Investing in our people
TA.7.6 Measuring improvements through our performance commitments
TA.7.7 Optioneering and Estimating
TA.7.8 Benchmarking Resilience and best practice
TA.8.1 Tackling affordability and vulnerability
TA.9.1 Delivering Great Customer Service
TA.10.1 Innovation: Supporting Evidence
TA.10.2 Understanding best-practice Innovation
TA.11.1 Water AMP7 Comparative Industry Performance Assessment
TA.11.2 Water Horizons - Southern Waters Long Term Asset Management Strategy
TA.11.3 Regional Water Grid
TA.11.4 Water Resource Bid Assessment Framework
TA.11.5 Havant Thicket Reservoir Resilience Project
TA.11.WN01 Business Case - Supply Demand Balance
TA.11.WN02 Business Case - Nitrate
TA.11.WN03 Business Case - Water Treatment
TA.11.WN04 Water Networks
TA.11.WN05 Service Reservoirs
TA.11.WR01 Business Case - Raw Water Pumping
TA.11.WR02 Business Case - Impounding Reservoirs
TA.11.WR03 Catchment Management Solutions
TA.12.WW01 Business Case - Wastewater Treatment
TA.12.WW02 Business Case - Network Pumping Stations
TA.12.WW03 Business Case - Outfall, CSOs and Detention Tanks
TA.12.WW04 Business Case - Sewers and Rising Mains
TA.12.WW05 Business Case - Wastewater Growth
TA.12.WW06 Business Case - Wastewater Environmental Programme
TA.12.WW07 Business Case - Flooding and Pollution Strategies
TA.12.1 Wastewater AMP7 Comparative Industry Performance Assessment
TA.12.2 Response to February 2018 feedback in initial bio-resources allocation proposals
TA.12.3 Mott MacDonalds PR19 Bio-resources RCV Allocation
TA.12.BR01 Business Case - Bioresources Treatment and Growth
TA.12.MG01 Business Case - M&G Fleet
TA.12.MG02 Business Case - M&G Data and Information Technology
TA.12.MG03 Business Case - M&G Buildings
TA.12.MG04 Business Case - M&G Research and Development
TA.12.MG05 Business Case - Central Costs and PR24
TA.13.1 Doubtful debt and debt management
TA.13.2 Management of gaps sites and voids
TA.14.1 Cost Adjustment Claim 1 - Bathing Water
TA.14.2 Cost Adjustment Claim 2 - Thanet Groundwater Protection Scheme
TA.14.3 Cost Adjustment Claim 3 - Growth - Whitfield
TA.14.4 Bottom-up Cost Estimation
TA.14.5 PR19 Approach to Optioneering
TA.14.6 Oxera Report: Estimate of RPE and frontier shift
TA.14.7 Top-down econometric analysis (Botex)
TA.15.1 Direct Procurement for Customers
TA.16.1 Our approach, evidence and assurance of Financial Resilience
TA.16.2 Changes to Capital Structure
TA.16.3 Oxera RORE modelling
TA.17.1 Performance Commitment Forecasting
Southern Water Bill Waterfall Model 31082018
Southern Water presentation pro-forma

Southern Water presentation pro-forma guidance tables
PR19 Data Tables
PR19 Financial Model