For the organ transplants, and you're talking about sperm, basically it's very clear in the legislation. I don't think it's part of the organ transplant. I think it's seen as separate, because of the potential it has, basically. And you have to sign a consent even if you die and somebody wants to take your sperm afterwards for the purpose of creating an embryo.
If it's for other purposes, the legislation doesn't cover it, but for the purpose of creating an embryo, you would have had to sign a consent prior to, to get your material withdrawn from you, and a consent to be able to use it to create an embryo for your spouse or your common law partner.