There is actually little the government can do to make amends. Pardoning is probably the best.
However, a pardon is the government forgiving a convict for their crimes. Not exactly appropriate, but perhaps it helps his estate.
What would be more appropriate would be a formal apology from the Queen where she asks his family for forgiveness.
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abusus non tollit usum - A right should NOT be withheld from people on the basis that some tend to abuse that right.
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