They treated me very badly before this not paying for overtime etc . demanding extra work for no extra pay ..
Wow, poor you - sounds like something from a Dickens novel!
So i think the naswer to your question is Yes but get all you can first !!!
Still, you obviously got your own back! well done you!
Just out of interest, OP doesn't seem to have been as badly treated as you have obviously been, do you still propose the same advice? i.e get all you can first?