[Closed] What’s the deal with EU/UK tariffs?

Seen a couple of bike related conversations but mine is none bike.

Where I work we send out branded promotional materials to lots of events around the world including the EU. When we post to China we have to list what’s in each box.

I’m now being told that posting to the EU I’ll have to list what’s in each box and each items country of origin. Is there any truth to this? If there is I imagine a lot of these materials are made in Asia but possibly have the branding done in the UK in which case that muddies the water a bit.

The materials are given away for free but obviously have a value. I’d like to avoid having to further paperwork as it gets shoehorned into my department.

Do free materials even incur import tax?

Thanks for any advice.