Generous Colin Harrison, 64, has helped save the lives of a staggering 1,200 adults or 4,800 children over the space of 30 years.<br /><br />But the grandad-of-two says he will now have to stop donating after the scar tissue on his arm became too thick for a needle to penetrate.<br /><br />The retired social worker first started giving blood after he got divorced from his wife in 1983.<br /><br />He has since donated a pint of blood every three months at Nottingham Donor Centre clocking up a staggering 227 litres or 50 gallons.<br /><br />Colin says he puts his generosity down to the free tea and biscuits – and a good conversation with the friendly nurses.<br /><br /><br />Read more at SWNS.com