The Civil Aviation (Working Time) Regulations 2004 limit the annual working time of airborne personnel to 2,000 hours, including overtime, and restrict flying time to 900 hours. They provide for seven rest days per month, 96 rest days per year, four weeks’ leave and “adequate” rest breaks. They also require “appropriate” health and safety protection for all mobile personnel and provide for health assessments and transfer from night work on health grounds.