Ethics approval and consent to participate
NHS ethical approval for the study described in the manuscript was granted by Harrow Research Ethics Committee (ref 18/LO/0649)/ IRAS project ID 239199. All participants in BC-Predict have completed written consent (usually online). All data participants in the comparison (usual NHSBSP) condition will be elicited in aggregate form, so individual consent will not be obtained. All women consented to join BC-Predict as there are no identifiable details.