Blood donation in England

In England, blood and other tissues are collected by NHS Blood and Transplant (NHSBT). NHSBT Blood Donation was previously known as the National Blood Service until it merged with UK Transplant in 2005 to form a NHS special health authority. Other official blood services in the United Kingdom include the Northern Ireland Blood Transfusion Service, the Scottish National Blood Transfusion Service and the Welsh Blood Service.
Donations.
The service depends entirely on voluntary donations from the public. Originally, Blood was collected from various donor clinics located over the country. In 1994, the first mobile session was held in Elstree, hosted by the Joely Bear Appeal. Currently, Blood donation sessions are set up throughout the country and take place in many diverse venues. From village halls, to mobile collection units (known as Bloodmobiles), and sessions set up companies and organisations so people can donate at work. New donors are generally required to be fit and healthy, weigh between and and be aged between 17 and 66. However, regular donors are permitted to donate past the age of 70 as long as they remain healthy. Female donors may give blood up to three times a year (once every 16 weeks) and male donors may give blood four times a year (every 12 weeks).
Pre-donation and exceptions.
Prior to each donation, the donor's iron level is checked to make sure they are not anaemic. The donor will be required to fill in a questionnaire to provide consent and declare that the donation will be safe (for example, stating that the donor does not have a heart condition), and it is safe to give the donor's blood to someone else.
Note: This 3 month deferral period only applies to England, Wales and Scotland - not Northern Ireland. Northern Ireland still has a 12-month ban in place for these groups.
Donating blood.
Once the preliminary checks are complete, the donor lies on a bed and a sterile hypodermic needle connected to a bag is inserted into a vein in their inner elbow. The donation usually lasts between five and 10 minutes, during which of whole blood is given.
Post-donation.
Following the donation (and subsequent dressing of the wound), donors are invited to refreshments. This period serves two vital purposes: to replace certain lost fluids, and to allow staff to monitor the donor's wellbeing.
Donations can also be taken by machines called cell separators, usually in larger blood donation centres located in city centres. These machines use a process called apheresis to collect either blood plasma only, or plasma and platelets, the other blood cells being returned to the patient. Platelets are the tiny fragments of cells in the blood which help it to clot and so stop bleeding, and are used in the treatment of cancer and leukaemia. A constant supply is vital because platelets only last five days once collected. People who give plasma and/or platelets can donate every two weeks, and each donation usually gives two or three adult doses. One adult dose of platelets would otherwise require four whole blood donations.
Blood Component donations.
Blood is made in the bone marrow. It is composed of red blood cells, platelets, plasma and white blood cells, collectively referred to as blood components. Donations given at regular blood donation sessions are referred to as "Whole Blood". 
Platelets are very small cells. They work with the clotting factors in plasma to form a mesh "plug" to stop or prevent bleeding. Plasma is the fluid part of the blood. It contains protein, salts and clotting factors. White cells fight harmful bacteria and help prevent infection. Red cells carry oxygen from the lungs to the tissues.
Most platelet donations are given to patients who are unable to make enough platelets in their bone marrow. For example, patients with leukaemia or other cancers may have too few platelets as the result of their disease or treatment. Also after major surgery or extensive injury, patients may need platelet transfusions to replace those lost through bleeding. Platelets are often life-saving and special in that they can help up to 3 adults or even 12 children. As platelets can only be stored for a few days, regular and frequent donors are in great demand and that is why platelet donors are asked to attend at least 8 - 10 times per year.
Controversy.
The service had come under criticism for a long implemented policy of banning men who have sex with men (MSM) from ever being blood donors. University students in both England and Scotland protested against the ban,
and University of Birmingham's Guild of Students banned the National Blood Service from setting up a recruitment stall during Freshers' week.
The policy was changed in 2011 to prevent MSMs from donating for 12 months after having anal or oral sex with another man (with or without a condom). This also applied to women who have had sex with MSMs. In November 2017 the referral period on MSMs was reduced to 3 months for both MSMs and women who have sex with them.
On 14 December 2020 the FAIR (For the Assessment of Individualised Risk) steering group announced recommended changes that should be taking place in summer 2021. The highlights of their recommendations include: 
Donors who have had anal sex with a new partner or multiple partners in the last three months will be deferred, regardless of their gender or their partner's gender,
All people who have had oral-only sex can donate and will not be deferred,
All donors will now be asked if they have had sex before, and
Donors who have had new or multiple partners recently will be asked if they've had anal sex in the last three months regardless of condom use. 
This means that for the first time MSM should be able to donate blood without any deferral as long as they are in a monogamous relationship that is longer than 3 months.
Legal.
A vs The National Blood Authority (Queens Bench Division). This trial concerned the claims of 114 Claimants, for recovery of damages arising out of their infection with Hepatitis C, from blood and blood products through blood transfusions from 1 March 1988. All the claimants received blood transfusions or blood products usually in the course of undergoing surgery, whether consequent upon having suffered an accident or otherwise, immediately after childbirth.