If you re an employee, you do have a contract - see http://employmentlawclinic.com/contracts�� for details.Even as a worker, you have a right not to work more than an average of 48 hours, so you should discuss this with your employer. The contract (although not in writing at the moment) should confirm whether you get overtime, but if you haven t received any yet, you should raise this with your manager, along with the excessive hours they are asking you to work.
The link below tells you all you need to know on the subject.Depends on the job you do. You shouldn t be working more than 48 hours if you are not opted out or doing any of the jobs listed. If you are working as a Nanny (and to work that many hours it looks like you might be) then that may not be covered.