Recently, the Home Office have started allowing for different names in two different passports if the law of the country of origin is strict and does not allow for the same rules as the UK.

See: Documents in various names.

Surnames certificate

In light of the above, the Spanish consulate now issues a certificate explaining this law in English so you can present it to the HO. There is a fee of £32.75 to pay for this service.

Spanish Consulate Information about surname certificates.

On a sample British passport of a Spanish child which shows the single British surname and on the page opposite (the one reserved for observations), there is following note: “The holder also has a Spanish passport issued xx/xx/2017 in the name of Firstname Surname1 Surname2 which is due to expire xx/xx/2019”.

You may want contact the consulate for more information.

This is a sample of the “surnames certificate” issued by the Spanish consulate. It states the law re. the Spanish surnames permitted as well as the law re. foreign names prior to 1994.

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