Hi Bobbi 33
The rules are that if your health has improved then you are supposed to inform the DWP. How soon you do this is something you will have to choose. If your mobility has improved then they are likely to reassess you. You need to be careful that 1, you don't inform them before you know that this is going to be a continuous improvement and 2. If you have other ongoing difficulties you make sure it is clear that you still have these and the impact on your life.
BIS
Nothing on this board constitutes legal advice - always consult a professional about specific problems