The Foreign Office has accused a Spanish survey ship of acting unlawfully and provocatively by sailing into British waters around Gibraltar.
This evening it responded by summoning the Spanish Ambassador - for the third time in two years - to explain the alleged incursion.
ITV News Europe Correspondent Emma Murphy reports:
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British soldiers will join troops from some 30 countries who work in the country.
The demand comes after the Prime Minister urged a "grown up" relationship between her government and the devolved administrations.
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