Just because you’re viewed as self-employed by HMRC for tax reasons it doesn’t necessarily mean you’ll be viewed like that for employment reasons, so it’s really important for you to know the terms of your employment. This really will affect your rights as:
The self-employed enjoy no statutory employment rights (although they may be protected by discrimination law)
An employer is responsible for deducting tax and national insurance at source (PAYE) from the salary paid to employees. Self-employed individuals are responsible for paying their own tax and national insurance under self-assessment
As you can see, none of this is particularly straightforward but the effects can be considerable. If you have any questions we’re more than happy to advise you in more detail on any of the above.