[sksksk]

Are you sure your passport wasn’t checked?

What you’re describing sounds like it was the customs check. Pre-brexit, if you were arriving from the EU, then there was no customs check since we were all part of the same customs union.

The usual flow is

immigration check -> baggage collection -> customs check

[aprdm]

Yeah wasn’t checked. I’m pretty sure it was a smaller airport than Heathrow. I definitely went through the wrong path out

[ssdspoimdsjvv]

Perhaps your passport was checked on departure instead of on arrival? At least that's how it worked when taking the Eurostar train.

[strbean]

Even if they did check his passport, he didn't have an EU passport so probably shouldn't have been allowed to skip customs.

[sksksk]

From a customs perspective, flying from one EU country to another EU is treated like a domestic flight.

If I (a British citizen) flew from London to New York, then on to Chicago; I'd expect to go through customs when I arrived at New York, but not when I arrived at Chicago.