ESN from Germany if you want expensive stuff, tastes pretty good though
HSN From Spain, much cheaper
Bodybuilding Depot from Germany, a bit less sweet. Bourbon Vanille Whey is pretty good.
Alpha Aktivnahrung from Germany, produces for some influencer “brands“. Milchreis-Zimt is awesome in porridge.
Edubily from Germany. Super high quality with labtests for everything. Quite expensive though
MyProtein from UK
Bulk seems the big one in the UK and their footer suggests they export across Europe.
Bulk are decent but pricey. MyProtein is a good mix of cost and quality.