When I went to Gibraltar in 2010, I passed through the border. The immigration officer did not check my passport carefully and did not give me a stamp. I had no real sense of the border and wondered why the presence of an office. But I understood that the fact that the UK and Spain have conflicts over this border means that this border is profoundly important to both countries.
¶Spain is studying retaliatory measures against the British territory of Gibraltar in an escalating dispute over fishing grounds, Spanish Foreign Minister Jose Manuel Garcia-Margallo has said. […] ¶The minister said Spain was mulling a €50 border-crossing fee and tax investigations of thousands of Gibraltarians who own property in Spain. […] Full text is here. Referenced from EURACTIV, 5 August, 2013