Spain opened a help desk at its embassy in London on Wednesday to answer questions from Spaniards living in Britain about the effects of Brexit on their lives.
The service will provide information on issues such as changes to university fees, residence permit rules, access to healthcare and taxation once Britain leaves the European Union, the foreign ministry said in a statement.
The office opened as the British government began the process to quit the EU over the next two years.
The Spanish government has said its priority is to quickly achieve a deal that protects the rights of Spaniards who live in Britain as well as those of Britons who live in Spain.
"We want to maintain in the most broad and generous way possible the rights that they actually enjoy," Spanish Foreign Minister Alfonso Dastis told a parliamentary commission on Wednesday when asked about Brexit.
There are some 130,000 Spaniards registered as living in Britain. Thousands more are thought to live legally in the country without having registered as permanent residents.