Seren has inspired her Girlguiding leaders to donate their plasma and hopes others will do the same.
Pioneering plasma exchange restores Jessica Kent-Hazledine's vision.
Nigel Vaughan has a rare blood type which can be used to help critically ill babies.
Stephen Cotterill, 43, first signed up as a blood donor aged 18.
About 200,000 donors in England have a special type of blood needed to help critically ill newborns.
Sarah says she got the call all parents dread after her son was violently attacked in Manchester.
Laura Fricker has spoken about her son, who had foetal anaemia and required a rare intrauterine procedure.
Rebecca's daughter recovered from Kawasaki disease after prompt treatment with donated plasma.
Serv deploys its network of motorbike riders and blood van drivers across the south of England.
