I have been working at a company and I received my final written warning Febraury 25th about my time and attendance. On July 17th, I was ill and unable to attend work. I emailed my workplace letting them know about my illness and when doing so I asked whether or not a sick note was needed. They did not tell me that I needed one and therefore, I did not get it. Upon my return to work, I was asked for it and because it was two days after, my doctor said he was unable to provide me with one. Due to me being unable to provide a sick note that they did not indicate was needed, I was let go. Is this lawful termination?