1. UK NEQAS (BTLP) West Herts Hospitals NHS Trust Watford UK
2. Department of Blood Transfusion University College London Hospitals, NHS Foundation Trust London UK
3. Department of Blood Transfusion Imperial College Healthcare NHS Trust London UK
4. Department of Blood Transfusion South Tees Healthcare Trust Middlesborough UK
5. Department of Blood Transfusion Leeds teaching Hospital NHS Trust Leeds UK
6. Welsh Blood Service Cardiff UK
7. Colindale Centre NHSBT London UK
8. Leeds Centre NHSBT Leeds UK
9. Tooting Centre NHSBT Tooting UK