When managing data of EU citizens, but does it still apply to UK companies managing data of UK citizens in the UK?

EU asserts extrajudicial authority but it's pretty meaningless. Can't see why it would apply to UK citizens in the UK at all.

> EU asserts extrajudicial authority but it's pretty meaningless

They can prevent a company to operate in the EU and/or fine them.

> Can't see why it would apply to UK citizens in the UK at all.

Exactly.