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You now get a completely different experience if you report a post in the EU compared to anywhere else in the world (including the UK).
The form you fill in now asks if the post is illegal under EU law and then presents you with various reasons as to why the post is illegal. If you use this option, posts tend to be removed rather quickly.
Everywhere else in the world just get the standard form, followed a week later by a "the post didn't break the rules ... why not use block" recommendation.
AKA: Want to report something on Twitter? Use a VPN.