Posted By Neal Robertson Hi Dean, I carried out some risk assessments for shiftworkers, following the basic rules of the WTD, assessing the risk of not conforming with each provision. I dare say the same would apply for on-call engineers. The basic rights provided by the regulations are: A limit of an average 48 hours a week which a worker can be required to work (though workers can choose to do more if they want to by invoking their voluntary opt-out in writing.) A limit of an average 8 hours work in 24 which night shift workers can be required to work A right for night workers to receive free health assessments. A right to 11 hours rest a day A right to a day off a week A right to a paid in-work break if the working day is longer than 6 hours A right to four weeks paid leave per year Hope this helps Regards