MR PIP

I put in a MR request for PIP a while back. I have been expecting to have to appeal. However, I have heard nothing back from my MR request, but my last PIP payment was for a different amount. I am cautiously optimistic as the payment was higher and met the level I was fighting for. Two questions - should the payment of a revised award be backdated to the date of the original decision? What paperwork should you receive after a MR has been carried out? Thank you

Thank you Bis. Do you know, or does anyone know, if the back payment is normally a separate payment? If so, does it come later?

Thank you. I haven't had a letter showing the MR result but last week my payment of PIP that went into my bank account was more, reflecting the Award I have been fighting for. Perhaps the letter and back payment is still to come. (I can't face phoning up the call centre). I will wait and see.