This makes sense though from a care optimization perspective though, yeah? Say an ML model is developed to predict a rare disease, and person 12345 scores highly by that model but has not been tested. Without IDs, the NHS would need to replicate the model on secure infrastructure to identify and potentially save the life of the person. With IDs, researchers most familiar with the methodology who already have the infrastructure set up can simply give a set of high-scoring IDs to NHS administrators.