The BHA said: “This is based on risk modelling, which indicates that field sizes of 12 or fewer reduces the risk to participants on the track and assists with social distancing requirements at the racecourse.
“We have taken in a similar risk mitigation approach in relation to jockeys. Consequently, only the more senior jockeys will be able to ride under initial plans. This will be reviewed continually.
“We recognise [field-size restrictions] will increase competition for places, so we plan to extend the number of races on a card including by staging more divisions. Even though we intend to provide a balanced programme, it is likely that due to competition for places, some horses, particularly those that are lower rated, may find it difficult to get a run in the early stages of resumption.”