The Clock: 6 August 2025

The Clock newsletter provides participants with updates and key information to support delivery of the MHHS Programme. The Clock will signpost you to events, plans, reports and documents to assist in planning, design, development, testing and delivery.

In this issue of The Clock we update you on:

• Programme News
  
  • REMINDER: Programme Design mailbox and Artefact transition - Effective from 1 September 2025 
• Participant Checklist
  
  • NEW! Milestone 10 (M10)/M11 Cutover reporting  
  • REMINDER: Milestone 8 (M8) Code Changes Artefacts issued for formal Code Body consultation 
  • NEW! Data Integration Platform (DIP) Onboarding: Promotion to Production 
  • REMINDER: Timelines for upcoming Qualification activities by Wave  
• MHHS Testing Updates
  
  • REMINDER: Systems Integration Testing (SIT) timelines by Pathway 
  • NEW! Overarching SIT Operational Overarching Exit Report Industry Review 
  • NEW! SIT Functional, Migration & Operational Requirements to Test Traceability Matrices (RTTMs) published  
• Guidance Documents
  
  • NEW! MHHS Work Off Plans Guidance Note 
• Upcoming events
  
  • Upcoming Governance Meetings  
  • REMINDER: Migration Dress Rehearsal 2 drop-in sessions: August 2025  
• What happened last week?
  
  • Last week's governance meetings
• Code Bodies Update
  
  • REMINDER: Retail Energy Code (REC) Code Manager Legacy Assurance Director Assertion - due today! 
  • NEW! Elexon’s Confidential Assurance Reporting Platform (CARP) is now live! 
  • NEW! Updated Balancing & Settlement Code (BSC) and REC Assessment Criteria   

The Clock

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