@SisyphusAndTheRockOfUntidiness
You can still register as an organ donor on the organ donation website and specify which organs you would be happy to donate. Reproductive organs aren't on this list: you have to give specific consent if you want to donate your reproductive organs, they aren't included in the opt out system.
This is from the government website about organ donation law:
5. Annex A: consent for rare transplants excluded from deemed consent
The list of organs and tissues below will continue to require express consent under the new system. This will mean that the potential donor (before their death), or their nominated representative or their family (after death), must explicitly give permission for the organs or tissues to be donated.
brain
spinal cord
face
nose
mouth
trachea (windpipe) - unless removed with the heart and lungs as part of a heart-lung transplantation, which is a routine transplant
arm
upper arm
forearm
hand
finger
leg
thigh
lower leg
foot
toe
ovary
uterus
penis
testicle
foetus
placenta
umbilical cord
vagina
labia
vulva
clitoris
cervix
fallopian tube(s)
prostate
perineum
embryo (inside the body)
limbal stem cells, renal epithelial cells, liver cells, and pancreatic cells – if they are used for an ATMP. These are medicinal therapies made from tissues, genes or cells manipulated in a laboratory
nervous tissue, artery, bone, muscle, tendon and skin – consent will be sought only if used as part of a rare transplant (above), but not a routine transplant in Annex B, unless they are part of a reproductive organ
This means that the new law allowing deemed consent for organ and tissue donation will not apply to these organs and tissues.