When does the 3 month relevant period for LCWRA payments start from?

Hi,
I am currently in the process of applying for UC and doing the WCA50 form. I have significant health issues (CFS/ME and OCD) and anticipate I should be found to be in the LCWRA category. I have recently learnt that the payment rate is being reduced by about half on 6th April. I am concerned about whether I will be ahead of this deadline or not. I understand that to get the higher rate you need to have your first payment before 6th April. I understand that once your assessment process is complete and you are found to be in the LCWRA category they backdate your LCWRA payments to 3 assessment periods after a certain point - I believe from when you "first submit medical evidence".

I am unclear as to whether this means 3 assessment periods after I first initially signed up to UC and listed that I have health conditions on my initial application and submitted my first FIT note (2nd Nov 2025 - so presumably this means I would get the higher rate)
OR
whether it is 3 assessment periods from when I hand in my WCA50 questionnaire (trying to finish it as I write this and will have missed the 6th April deadline)

Does anyone know when the 3 months is from? It is unclear from my research online although lots of places seem to suggest its from when you first submitted your first FIT note and I hope that is the case.

Thank you very much in advance for any knowledge on this.

Hi David
Thank you very much for your helpful reply, I really appreciate it. When you say "the first medical evidence" - does this mean the first FIT note I submitted when I made my new UC claim? Or is it when I hand in my WCA50 form?
Thank you very much.
Best wishes
Mel

Hi David
Ok that's great. Thank you very much for your help and the information. I really appreciate it.
Best wishes,
Mel