Letter from Dr Marcela Contreras Director National Blood Transfusion Service to Dr A.Smithies Department of Health and Social Security confirming the ability to commence screening unofficially from the 23rd September 1985. Reason they hardly have a high stock and their fresh frozen plasma gets snapped almost immediately. The only stored material is Cryoprecipitate. Serum samples have been stored for months they will check records of their cryoprecipitate stocks to see which stored donors samples correspond to the stocked material.