There are laws about young people working that cover at what age you can do certain kinds of work, how many hours you can work and when you can begin working full-time.
You may need a permit to work. If your employer lets you work when the law says you can’t and you have an accident, you may not get money to help you with your injuries. Fact - Every 40 minutes in the UK a young person is seriously injured in the workplace, according to the British Safety Council. For information look at the Related services and External links sections.