M10/M11 Cutover Plan

The M10/M11 Cutover Plan sets out the activities that MHHS participants are required to carry out in the lead up to M10, at M10, and between M10 and M11 to enable the Programme to successfully reach both M10 and M11 respectively.

It outlines:

• What these activities are 
• When they are expected to take place 
• Who the responsible parties are 
• The declaration requirements that participants will be expected to follow  
• Key dependencies that may impact particular activities 

In May 2025, the Programme received Participant Cutover plans from Licensed Distribution System Operators (LDSOs), Central Parties and Systems Integration Testing (SIT) Suppliers & Agents.

Following a review of these plans, the Programme published an updated consolidated Programme M10/M11 Cutover plan for consultation. This consultation closed on Friday 11 July 2025. Thank to you everyone who responded. 

 The team has addressed all comments and you can view the responses in the Consolidated Comments Log below. Where required, the feedback has been incorporated, and you can view clean and red-lined versions of the M10/M11 Cutover Plan below. The updated M10/M11 Cutover Plan is scheduled to be baselined at the Migration & Cutover Advisory Group (MCAG) on Tuesday 22 July 2025.

M10/M11 Cutover Plan v1.3 (Clean)

M10/M11 Cutover Plan v1.3 (Red-lined)

M10/M11 Cutover Delivery Plan v1.3

Consolidated MHHS M10/M11 Cutover Plan Comments Log

The Programme is holding engagement sessions with LDSOs and M10/M11 Suppliers & Agents to provide participants with an opportunity to ask any questions on the following dates:

• LDSOs: Wednesday 16 July 2025
• M10/M11 Supplier and Agents: Thursday 17 July 2025
   
  If you have any questions, please email opreadiness@mhhsprogramme.co.uk.

In addition, those parties that receive feedback from the Programme on their Cutover Plans will be required to submit updated submissions as detailed in the Participant Cutover Plans section below.

Please note that this includes submitting an updated participant Cutover Plan template which has been updated to reflect the updated Cutover Plan.  

If you have any questions, please email the Transition & Operational Readiness team at OpReadiness@mhhsprogramme.co.uk 

Cutover Consultation timelines and engagement

We've published a slide below outlining the engagement approach we're taking to the Cutover Plan.

If you have any questions, please email the Transition & Operational Readiness team at OpReadiness@mhhsprogramme.co.uk 

Participant Cutover Plans

As detailed through the Transition & Operational Readiness Working Group (TORWG), the Programme requested that Central Parties, Licensed Distribution System Operators (LDSOs), Systems Integration Testing (SIT) Suppliers and SIT Agents share a Cutover Plan with the Programme.

These plans outline the technical cutover activities that each participant must undertake to ensure that their systems are fully deployed, operational, and comply with the M10/M11 Cutover Plan deadlines, enabling the Programme to successfully meet both the M10 and M11 milestones.

The Programme has reviewed all Participant Cutover Plans and individual feedback was issued on Friday 27 June 2025. Participants were required to respond to the feedback that they receive through an updated submission, in line with the request below by Friday 11 July 2025. 

You can view the Consolidated Programme M10/M11 Cutover Plan above on this page.

The deadline to submit updated participant plans was Friday 11 July 2025.  Thank you to everyone who responded.

You can view the updated constituency group templates in the libraries below.  

If you have any questions, please also email Opreadiness@mhhsprogramme.co.uk