I am sorry you are getting conflicting advise - I worked for HMRC for 26 years providing education on employment status and whilst there are occasions when there is scope to contract (become self employed) these are far and few in between, so whist I respect the fact that Bigduck is trying to allay concerns you cannot ignore HMRC legislation on the topic
Employed or self-employed?
A worker's employment status, that is whether they are employed or self-employed, is not a matter of choice. Whether someone is employed or self-employed depends upon the terms and conditions of the relevant engagement. The tax and National Insurance contributions (NICs) rules do, however, contain some special rules that apply to certain categories of worker in certain circumstances. See section on special cases.
If you work for someone else, it is important to know whether you are working for that person in an employed capacity or in a self-employed capacity as an independent contractor. If you are an engager, it is your responsibility to correctly determine the employment status of your workers. A worker's employment status will determine the charge to tax on income from that employment or self-employment. It will also determine the class of NICs, which are to be paid.
So if you would be happy to advisee what your jobs are - what duties you perform and what business equipment of your own you have and use, and whether you could make a profit as well as a loss, whether you will advertise to other businesses to provide these services, as a start point that would be great
Then we can be sure you are being advised the right pathway for you, within the remit of what the businesses that are engaging you are permittd to allow. Thanks