By James Rodger & Susie Beever Brit holidaymakers have slammed a new rule that could jeopardise people’s trips to Spain. The new rule has been brought in by Spanish lawmakers requiring tourists to prove they have €113.40 (£97) on hand every day if they visit. It applies to both the mainland, and its archipelagos popular with British sunseekers, the Canary and Balearic islands. But its introduction has not been met kindly by British tourists, many of whom have hit out and even vowed to “boycott” the country. It comes as Spain has been cracking down on the impact of tourism on its environment an…