Hi Pingusolid
It's not uncommon for there to be quite a gap between the date on the letter and the date you receive it.
As you're moving from DLA to PIP, you need to treat it like an entirely new claim. PIP is very different from DLA and you will need to fill in the form and provide any additional medical evidence.
You will certainly need to download the up to date guide - (April 2019).
Guide to PIP claims and reviews If you don't have anyone to help you complete the form and you suffer from memory problems, only work on one question at a time - read one question, check the guide for the relevant information and then write your answer.
BIS
