[Olog-hai]

Not correct. The Bundestag and Bundesverfassungsgericht can indeed veto (or alter) EU legislation, being the only non-EU bodies (and national governmental bodies) with that power.

[JSDude1]

If the UK decided to take up this power through their Parliament (or exit the EU as constructed) they COULD ABSOUTELY do it. It would be a matter of also restructuring UK courts and police powers over enforcement over regulations as that would be the next step to block anti-UK legislation.