breaks deducted off each hour of work time

Hi, I am contracted to work 5 hours a day over 4 days a week, I am the administrator also, my work is in a care home and I dont take breaks because I only work 5 hours a day. My head office have said that everyone has 5 minutes for every hour deducted off our hours and we are paid the remainder, they even take this off our annual leave? can they take this off me when i work under the 6hr rule - they even do it to a man who works 3 hours a day! it is in our contract which we have to sign to start the job

breaks deducted off each hour of work time