People often confuse apostille and legalisation, and the terms are sometimes used interchangeably. However, they refer to different processes, and understanding the distinction is important when using UK documents abroad including in Spain.

An apostille is used when both the issuing country and receiving country are members of the Hague Apostille Convention. The process involves one certification from the designated authority in the issuing country.

For UK documents being used in Spain, this means obtaining a single apostille from the FCDO. The apostille process is simpler, faster, and more cost-effective, which is why it is the correct route for almost all UK documents intended for Spain.

Full legalisation is required when one or both countries are not members of the Hague Convention. This process usually involves multiple steps, such as:

• Authentication by the issuing authority or a solicitor/notary
• Certification by the FCDO
• Authentication by the destination country's embassy or consulate

Because Spain is a Hague Convention member, full legalisation is not required for UK documents going to Spain. In most cases, only an apostille is needed.

Legalisation terminology may still appear in some situations:

• If documents from a non-Hague country are being used in Spain
• If a Spanish authority refers to “legalisation” when they actually mean an apostille
• In rare cases involving older documents issued before Hague Convention membership

Terminology Note: If a Spanish authority asks you to legalise your UK documents, they almost always mean obtain an apostille. In the UK-Spain context, the correct and practical solution is to get an FCDO apostille.