Blood donation works largely like it does in the US, at least for donors. First, you can register at the following website:
http://www.blood.co.uk/Fill out the registration, email confirmation, etc. You can even book an appointment at that time. A few days after booking the appointment, you will receive a questionnaire along with your appointment details. Fill it out with a blue or black pen. Then you are set for your day of appointment. The site will give you an idea of who can donate and who can't, and you will get a further idea when the questionnaire arrives.
I used to donate regularly, but I haven't in years. It's good for you (studies have shown health benefits for the donor), and it might help save a life. I'm on the organ donor registry as well, and it's really easy to register for that. I am considering donating bone marrow, but I have to admit, it's a bit of a step I am hesitant to make. I will probably will end up doing it. It's something I feel strongly about, and I know others do too. I am creating this in case someone here wants to donate, but hasn't taken that first step.
My first experience in the UK:
I arrived a bit early, but the "carer" saw me right away. He went over my questionnaire. Asked me about my visit last year to the US (you need to wait 4 months after travelling to the US and CA if you go in the summer). He asked how long I've lived here. Asked about my operations. He had to call a nurse over because he didn't understand about my plate in my leg. He then pricked my finger and tested my iron and haemoglobin levels. I was then sent to sit in another area and drink some water.
After a few minutes, I was called over to a stretcher. They had music playing, so keep that in mind if you want to bring reading materials. I brought my Kindle, but really, I guess I could have done without. One of the people there started the bag up (took a bit). I was done pretty quickly. I then had to hold a gauze on my arm for 3 minutes (they set a timer). After the timer went off, they plastered me and added a sort of hard, tubular thing (never had that before). They gave me instructions and sent me over for refreshments.
You're meant to stay at the refreshment table for 10 minutes. During that time I was asked to book another appointment, which I did.
All told, it was a quick and relatively pain-free procedure. Hope this encourages someone else to book an appointment.