The blood donor service (NHS blood and transplant) sells donated blood to NHS Trusts, all part of the internal market, so it has to be able to fund itself within the budget given by the DOH. Walk in clinics are expensive and seen as inefficient, the NHS spend about 300 million a year buying blood products, so the NHSBT is tasked with reducing the cost of each unit. Personally for me the internal market in the NHS just didn?t work and patients, donors, health professionals all think walk in is great and convenient, but it does come with a cost.