Self employed workers got a double hit by tax rises in the Budget, even though it had been a manifesto premise by the Conservative party that they would not. The rises will affect the self-employed by about £500 a year.
The UK government says:
"A person is self-employed if they run their business for themselves and take responsibility for its success or failure. Self-employed workers aren’t paid through PAYE, and they don’t have the employment rights and responsibilities of employees."