Are individuals engaged on a casual basis entitled to statutory rights?

I regularly engage individuals on a casual basis to carry out work for my company.  Some are now saying that they should have certain rights and payment from me.  I have always considered that they are self-employed.  How do I handle it?

Whether individuals are self-employed, company employees or workers depend on a number of factors and the true nature of their relationship with the company.  The exact nature of that relationship will determine what rights the individuals have and what your obligations to them may be. 

It is often thought that the determining factor in considering whether individuals are employees will be the documentation which surrounds that