If your company engages individuals on a self-employed basis, there is a good chance HMRC will question how and why they are self-employed if they open an enquiry into the business.
Trinity Tax can provide as much or as little assistance as you wish.
The law on employment status is far from clear and the chances of getting through a challenge without a solid understanding of the area, supported by case law are pretty slim. For every argument you can put forward as to why they are self-employed, HMRC will be able to produce a counter-argument and it can be quick and easy to go from believing you are in a good position, to crying into a pillow wondering what happened and how you have ended up with a massive HMRC debt.