HMS Scimitar was using Flag No.1 during gunnery practice _ not the Spanish national flag.

"HMS Scimitar was using Flag No.1 during gunnery practice _ not the Spanish national flag. Flag No.1 is traditionally used on gunnery targets due to its high visibility. However, we recognize its similarity to the Spanish national flag and will use an alternative marker during gunnery practice in this area in the future," a ministry spokesman in London said on condition of anonymity in line with government policy.
When a Spanish Civil Guard patrol boat approached the British vessel, the sailors in it quickly pulled the buoy out of the water, covered up the machine guns it had been using to fire at the marker, and warned through a bullhorn that the Spanish boat was in its way and head to leave, the newspaper El Mundo reported.Deputy Prime Minister Maria Teresa Fernandez de la Vega said the British ambassador has promised "a thorough investigation and to demand the corresponding accountability, taking the necessary measures so that an incident like this does not happen again."