just noticed this on the BHA site
Early notice for 2023/24: National Hunt flat race changes
The following changes will be introduced for the start of the 2023/24 season:
1. A maximum of three runs permitted in National Hunt Flat races.
The only exceptions will be where:
the fourth run is in the Grade 1 Champion Bumper at Cheltenham, or the Grade 2 NHF at Aintree. Where the fourth run is in the Grade 1 Champion Bumper at Cheltenham, a further fifth run is permitted in the Grade 2 NHF at Aintree.
In the case of fillies and mares, a fourth run is permitted in either the Listed Mares’ NHF at Sandown in March or the Grade 2 Mares’ NHF race at Aintree. If the fourth run is in the Listed Mares’ NHF at Sandown in March then a further fifth run is permitted in the Grade 2 Mares’ NHF race at Aintree.
2. 6-year-olds no longer permitted to run in National Hunt Flat races after the final day of the Jump season (April 2023).