By Monica Charsley Chaos has erupted at Gatwick Airport this morning after holidaymakers were evacuated when a fire alarm went off. There are fears the knock-on effects will make flight delays “inevitable” according to passengers caught up in the chaos. Several holidaymakers took to social media to question what was happening, as many of them said they have been left in the dark. According to the passengers, the commotion took place after the alarm went off in the South terminal. They explained that there was a “huge evacuation” and described the process as “awful”. One shocked passenger said:…