Once you are resident in Spain, most UK pension income is taxed in Spain and not liable to UK taxation. The exception is government service pensions, which remain only taxed in the UK. There is no 'tax-free lump sum' in Spain.
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Pensioners are categorised as “economically inactive” in Spain, which means they have to fulfil extra requirements to stay in the country, compared with working age people. There are two types of visas to earn the right to live in the country: the “non-lucrative visa” and the “golden visa”.