The damage has already been done. It is not reversible. Apologies do not mean much usually. They probably mean less than nothing coming from a government.
I agree that they don't mean much, but I wouldn't say "less than nothing." Rather, I'd say they count for "something slightly more than nothing."
If the government of the UK were to apologize, the story of Turing's mistreatment at the hands of the government would fill a news cycle. It's not much, but it's not nothing.
