Will for Spanish Testator

Hello

I am instructed to prepare a will for a client with a habitual residence in England. He works here and has adopted a child here. He owns property and has bank accounts here. He has immoveable property in Spain which is co-owned. He intends to sell the Spanish assets eventually.

Their main concern is guardianship. The other bequests/wishes are not complex.

I occasionally prepare wills for clients with foreign property but the domicile can rarely be anything other than UK (England). However, when a person was born in a foreign jurisdiction and has a passport from that jurisdiction then I am unsure as to whether this is as straightforward as it at first appears.

Any comments would be greatly appreciated.