I am also on a lighttouch and now a pensioner, however, since the light touch, I have lost sight in one eye and have fuchs Dystrophy abd macukar degeneration in tge other. Whilst I know as a pensioner, my mobility part cannot be introduced, but I think the Daily living can? As niw I gave serious problems cooking 9reparibg food etc
You are correct and things to keep in mind
Easier if you have strong supporting evidence
I assume you are aware a reported change of circumstances at review will now allow DWP to relook at the whole of your award
When your circumstances changed the DWP would have expected to have been updated asap
Good luck best wishes