https://questions-statements.parliament.uk/written-statements/detail/2024-11-12/hcws205
DWP will steadily increase the number of migration notices being sent to people receiving ESA over the next months and are aiming to issue 63,000 migration notices each month from February, sending the final notices in early December 2025 and fully moving people to Universal Credit and closing legacy benefits by the end of March 2026.