Open question: Can an independent work in a hotel, pub, restaurant?

Hello, am I a Romanian and worked as independent generally speaking hotel in Great Britain, and I ask, how it comes I worked there, how “independently” to do something is not, which her and I know? Worked in the same place for the same hotel for some months I had a minimum of 40 hours/week 5,8 hour and overtime I answered to a manager, whom I had to pay to NIN of contributions and TAX Did not sign an agreement a contract Did not have paid Stechpalme, the day you to thank