As far as we can see at EVGA's official European page, the cashback programme is available in most bigger countries in Europe including the United Kingdom, Germany, the Netherlands, France, Norway, Sweden, Finland, Denmark, Hungary, Poland, Spain, Czech, and Belgium, but it is also limited to certain partners in those countries.
There is also a list of products that are eligible for this cashback promotion and includes most, if not all, GTX 1080 and GTX 1070 graphics cards from EVGA.
The promotion will run from April 1st to April 30th so in case you are looking to buy a GTX 1070 or GTX 1080 in Europe, this just might sway you to get an EVGA version.
You can check out the full list of partners and products over at EVGA's dedicated cashback promotion page.