If you are
b) over 18
c) live in the UK
then you could help Breakthrough Breast Cancer with a wide-ranging research study aimed at finding out more about the factors (environmental and genetic) that influence a person's chance of getting breast cancer. All that is involved is filling in a detailed questionnaire and giving a blood sample (they will send you a pack for you to take to your GP for the sample).
If you are interested please visit http://www.breakthroughgenerations.org.uk/ for more information or to sign up for the study.