I have been contracting to the same company for 5 years and this has now come to an end after false allegations were made about my setting up in competition with them and soliciting their clients - all of which is untrue. I am considering suing the lady that made these allegations for defamation. The guy that runs the business I have contracted to has been threatening to sue me, however, there is no evidence that I have done anything - even to the extent that I was still working for him. However, ironically, one of my old clients caught wind of this and has contacted me directly stating that he only wants to work with me going forward. I never signed a contract during my time there so would I be OK under contract law if I now decide to work with any of my old clients that approach me directly and want to just work with me?