Open Water brings together Defra, Ofwat and MOSL with the relevant companies to oversee the design and delivery of the new market. To enable the market to open, all those involved in creating and running the market will need to complete programmes of work and be able to demonstrate that they will ready when the market opens.

In order to provide a structured approach to the provision of this assurance, the Open Water programme commissioned Deloitte to work with stakeholders on the development of an Assurance Framework.

The Assurance Framework sets out the areas where formal assurance will be required to support decision making in the run up to market opening. This will be delivered through formal letters of assurance, the content of which will inform the Secretary of State’s decision to allow the market to open.

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