It turns out just yesterday I dealt with this matter. I had to pay some import taxes for a pair of new binos imported from China.
I paid 195 € for the binoculars, in its "final cost estimate", the merchant estimated another 40 €, so the "expected" final price would be around 235 €... but lo and behold, you can always expect surprises from the customs (I've bought binoculars from US, UK, Japan, China, Australia, Russia and other foreign non-EU countries, and I've experienced similar stories over the years).
Value of the binoculars: 194,78 €.
Custom "rights": 8,91 €
Import VAT at 21 % (for some reason they calculate it for 220,96, and not the original value), so 46,40 €
Pre-Total 55,31
Services provided by Correos (Spanish Postal Service)
Custom management fee: 20,35 €
Handling expenses: 4,96
VAT for the above: 5,29 €
GRAND TOTAL: 85,81 €
So, in the end, a good deal at 195 € ends up costing 280 €, which is a price I don't think I would have considered in the first place (rolling eyes).
Regarding importing binoculars from overseas I'm always very jealous of the US. First, they seem to have very good deals on many brands, and then they don't pay import taxes.
As for Brexit, it was a bit of a disaster for EU birdwatchers, because the UK market for all-things birdwatching is so large, there has always been an enormous 2nd hand market of books, guides... and optics. My binoculars, my scope, my field guide and many other books (like the BWP I got for peanuts) were great 2nd hand deals from the UK, but now most of the things I check online on the 2nd hand market in the UK end up not being a great deal anymore due to import fees. Such a pity, really.