> allowed the UK to control its own migration policy

Has that helped? Seems like they traded-off Eastern European migrants (who all fled during the pandemic because life in their own country is now much better than in the UK) for Middle Eastern migrants who have nothing to lose and for whom this disaster of a country is still an upgrade over what they had before.

But after brexit your immigration from non eu countries increased dramatically? Now you have even more immigrants from questionable countries

> it allowed the UK to control its own migration policy.

UK is still in the ECHR, so, not really, not yet

That’s true. Labour opposes leaving. But their leader has near record low approval rating so that may not mean anything.

yet non-EU immigration vastly increased after brexit.

> and it allowed the UK to control its own migration policy.

As in: Brits found out that they need to queue like the rest of the world to get into the EU and migration from the EU decreased.

However, net migration to the UK has increased since Brexit.