Actually neither of them has English as their "official" language in the EU because you only get to pick one, and they both want to promote native languages (Irish and Maltese) instead.

Now there's a funny game of chicken to see if one of them will blink and switch to requesting English in the EU: https://www.politico.eu/article/english-will-not-be-an-offic...

But as a matter of practicality, I'm sure English will continue to be used as a working language across European institutions.