The number of British tourists arrested overseas last year increased by 6%, reports the Foreign Office, suggesting that the rise could be due to development of a zero tolerance approach towards drinking and drugs in holiday spots popular among UK tourists. Most number of Britons were detained in Spain, with nearly 2,000 - up 9% on 2010. The USA and Thailand followed Spain in the list for detentions. There is almost a 30% increase in arrests on the Balearic Islands of…