morriszap and everyone else!
You NEED to tell people your wishes. I've copied and pasted from the donation website
Why should I discuss my wishes with my relatives?
So that they know what you would like to happen after your death and can confirm or help inform NHS staff what your wishes were. If you register your wishes without telling the people closest to you, it may come as a surprise at a time when they are trying to deal with their loss.
If you think you would find it difficult to raise the subject, you could try using this booklet or a TV or newspaper story about a transplant to start a discussion.
What will happen if my relatives object?
We know that in most cases families will agree to donation if they knew that was their loved one?s wish. If the family, or those closest to the person who has died, object to the donation when the person who has died has given their explicit permission, either by telling relatives, close friends or clinical staff, or by carrying a donor card or registering their wishes on the NHS Organ Donor Register, healthcare professionals will discuss the matter sensitively with them. They will be encouraged to accept the dead person?s wishes and it will be made clear that they do not have the legal right to veto or overrule those wishes. There may, nevertheless, be cases where it would be inappropriate for donation to go ahead.