Uff you sent me on a google hunt!
I found this as well, it seems the rules have been changing quite rapidly and often. It seems I may need to contact a lawyer. I hate to waste money on that!
"Inheritance and gift tax in Spain
The rules regarding inheritance and gift tax in Spain (also called succession tax) have now changed so that non-residents from within the EU/EEA are treated the same as residents. Previously, non-residents were charged around 80 percent more than residents. Now the rate is around 1–7 percent for all (depending on region). If you have paid the higher rate in the past (specifically from 1 January 2011–2015), you may be entitled to a refund.
As of 2017, some regions such as Andalucía have updated their inheritance and gift tax policies, resulting in many families not having to pay inheritance tax. Check your specific region’s laws for more information. You should seek specialist advice on these taxes as the Spanish tax system is complex. Read more in our guide to Spanish inheritance law, tax and writing a Spanish will."