You'll be able to play on European servers as well no worries, like modern warfare before it you can swap the region of servers from the launcher. Worry not you'll be able to play with the same people you would if you purchased from the UK store.

I get it now, thanks man!

Yes, you're good to go!

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Hey there. Yes, after purchase you go to your Gamesplanet account and from there activate the game. You find more details here: https://us.gamesplanet.com/support/23-activations/271-activation-with-battle-net-direct

Do I first have to change regions on my battlenet account?

Tak, gra będzie działać :) Dla uściślenia - to nie jest klucz tylko bezpośrednia aktywacja. Po zakupie, odbierasz grę z konta Gamesplanet i bezpośrednio aktywujesz na koncie. Możesz poczytać o tym dokładniej tutaj: https://us.gamesplanet.com/support/23-activations/271-activation-with-battle-net-direct

Yes, it will :)