Kestrel Dress Rehearsal 2

Kestrel Dress Rehearsal 2 builds on Kestrel Dress Rehearsal 1 by including all participants, not just Suppliers, and demonstrating that Kestrel can support key reporting requirements such as:

Plan vs Actual Outturn
Aggregated Outturn Reports
In Dress Rehearsal 2, synthetic data will be used to simulate real-world Migration scenarios. This allows participants to test processes without impacting live operations.
Dress Rehearsal 2 also ensures that all participants are familiar with the Kestrel platform, reporting outputs and submission processes ahead of live Migration phases.

As part of Dress Rehearsal 2, participants are expected to:

Access and review simulated reports via the Kestrel portal
View their Committed Baseline Schedule and Daily Outturn Reports (Systems Integration Testing (SIT) Suppliers only)
Access aggregated baseline schedules and progress reports (Non-SIT Suppliers and all other Programme participants)
Familiarise themselves with the test scripts and report schemas ahead of the testing window (all Programme participants)

If you have any questions about Dress Rehearsal 2, please email the Migration team at Migration@mhhsprogramme.co.uk

Dress Rehearsal (DRH) 2 Mandatory participants

1. All SIT Suppliers

must undertake Sprint Execution activities
review synthetic committed Daily Baselined Schedules
review Daily Migration Outturn Reports: (RP-04 - Plan vs Actual) and (RP-05 - Transaction Summary)

2. All SIT Licensed Distribution System Operators (LDSOs) (BUUK & SSEN) and Data Communications Company (DCC)

view Aggregate Baselined Schedules
review example Aggregate Daily Migration Outturn Reports: (RP-04 - Plan vs Actual) and (RP-05 - Transaction Summary).
- The Migration team are working to understand if this can be completed in Kestrel and will confirm by the end of July 2025.

Dress Rehearsal (DRH) 2 Voluntary participants

1. Non-SIT Suppliers

review example of Daily Migration Outturn Reports: (RP-04 - Plan vs Actual) and (RP-05 - Transaction Summary).
- The Migration team are working to understand if this can be completed in Kestrel and will confirm by the end of July 2025.

2. All other LDSOs

view Aggregate Baselined Schedules
review example Aggregate Daily Migration Outturn Reports: (RP-04 - Plan vs Actual) and (RP-05 - Transaction Summary).
- The Migration team are working to understand if this can be completed in Kestrel and will confirm by the end of July 2025.

Key dates and timelines

21 July 2025 - Report schemas will be shared with all participants
4 August 2025: Test scripts will be issued to participants
6 August 2025: Migration team will host second Kestrel Dress Rehearsal 2 webinar to walk participants through the test scripts
11 - 29 August 2025: Dress Rehearsal 2 three-week testing window