The decommissioning organ donation law goes into effect today, with the prospect of 700 additional transplants being performed each year until 2023.
The new law, called Max and Keira's Law, was inspired by two sons – Max Johnson and Keira Ball.
Keira Ball passed away three days after suffering a car accident near her home in Devon in July 2017, which left her with serious head injuries.
Motivated by a desire to help others, her family made the decision to allow her to become an organ donor.
The new law sees a shift to an opt-out system, whereby people aged 18 and over are considered to have given their consent to donate their organs, unless they explicitly state otherwise.
Keria's mother, Loanna Ball, said the new law would mean that her daughter would survive it.
She told Emma Barnett of BBC Radiod 5 Live: "Kiera was such a special child and what she did is just incredible.
"We are impressed and she inspires me every day.
"Now, with Max and Kiera's law taking effect, it will defeat us."
Ball added that it was inspiring to think about what Kiera did "in her nine years of being here" and what a difference the new law will now make for others.
Max's mother told the BBC that she felt a "huge wave of gratitude" towards the Ball family "who, in the most extraordinarily traumatic circumstances, had the compassion and generosity to say" yes ".
Although everyone is considered to be an organ donor, this is not mandatory.
The organs you can donate are the heart, lungs, liver, kidneys, pancreas and small intestine.
It is also possible to donate your tissues, including the cornea and bones.
BHF adds: "Just because you had an underlying health condition, it does not necessarily mean that you cannot donate your organs, although this may limit what you can donate".
However, if you currently have or are suspected of having one of the following conditions, you cannot donate your organs:
- Creutzfeldt-Jakob disease
- Ebola virus disease
- Active cancer
- COVID-19 active