Well done to you Gemma - thats an amazing contribution to society! I am on the donors list for blood, and I am going to give plasma once my body is my own again. I dont know if I could do marrow - it sounds so hurty!!!!
I have found it very difficult being off the donor's list for the last 2 years (with another 18m to go!) with being pregnant and breastfeeding. But - I guess they will get it again when its all over for as long as I can.

I think what you have done is incredible. Kudos to you.