This app was mentioned in 5 comments, with an average of 2.20 upvotes
I used to do that but the anticoagulant started to send me all funny so I went back to whole blood.
52 credits to my name.
Everyone get out and donate if you can.
UK NHS app.
http://www.blood.co.uk/ Is a website specific to the Uk and here is their app.
I'd try multiple apps and than narrow it down by which ones do and don't work in your area.
For anyone in the UK
No sport or donuts but you'll get a biscuit and a drink.
NHS blood donation.
NHS Give Blood
Do it......Do it......Do it.