Ministers have said they will legislate "as soon as possible" to make fostering by potential adopters standard practice.
Education Secretary, Michael Gove, said: "The Government owes it to children to encourage more parents to consider adoption.
"In reforming the system we are determined to make sure the child's interests are paramount."
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He said people have handed over thousands of pounds in good faith, only to find the advert has nothing to do with Mr Lewis or his company.
The memorial service will be attended by Prince Harry and Meghan Markle.
David Browning admits manslaughter by diminished responsibility but denies murder.