MOSL manages changes to the Market Arrangements Code (MAC) and Wholesale Retail Code (WRC) on behalf of the non-household market. Changes can be proposed by any industry participant and MOSL supports proposers to design and develop proposals prior to Panel review and Ofwat determination whether to implement the proposal. This page provides information on current changes, how to engage with the change process and how to propose new changes.

MOSL prepares a change report for the Panel each month describing the progress of each change proposal and the anticipated implementation programme.  The current change report can be downloaded from the link on the right.  Previous reports can be downloaded in the Panel papers.

MOSL may consult on behalf of the Panel to gather evidence on the need for and impact of a change proposal. Input from market participants and customers is welcomed and live consultations can be accessed through the link on the right.

If you wish to raise a change please follow the link on the right which provides templates and contact details to submit changes.

The Change Register below shows all proposals that have been formally submitted to change the Market Arrangements Code (prefixed CPM) or Wholesale Retail Code (prefixed CPW). Please use the filter and sort functions to navigate past and current changes and click on a change to view the documents associated with it.

Change Register

Reference Title Status Implementation date
CPW120 Final Meter Reads where no Visual Read is available Planning -
CPM044 Management of the Ofwat Innovation Fund Planning -
CPW118 Minimum Meter Read Frequency Post-consultation 13/05/2022
CPW119 & CPM042 Dormant Trading Party Provisions Post-consultation 05/11/2021
CPW122 Introducing Direct Debit as a Payment Method Post-consultation 05/11/2021
CPW123 Improved codes for ‘remote read type' Post-consultation 30/11/-0001
CPW110 & CPM041 Sharing Non-Household Emergency Contact Details Recommendation 13/05/2022
CPW080 Simplification of the Default and Termination Process Awaiting Ofwat Decision -
CPW106 Management of Long-Term Vacant Supply Points Awaiting Ofwat Decision 05/11/2021
CPW117 Shortening the late payment default timeline for a credit support reduction Awaiting Ofwat Decision 05/11/2021
CPM015 & CPW071 Panel self-governance Awaiting Ofwat Decision -
CPM035 Panel Election Streamlining Awaiting Ofwat Decision -
CPW070 & CPM043 Bilateral Interfaces Solution Awaiting Implementation 22/09/2021
CPW116 & CPM038 Clarification and removal of redundant clauses in the Unified Disputes Process Awaiting Implementation 01/09/2021
CPM039 & CPW124 Revisions to Panel Composition Awaiting Implementation 01/09/2021

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