hi please can you help me, i am on esa support group. i was on pip enhanced daily living and mobility. then i had an assessment earlier this year both were reduced to standard. i fought with everthing i had in me and got my award back to enhanced for living and mobility. but i have noticed the severe disability premium is missing. im not sure how i get this back, also will they back date this.? what do i need to do? and is there any time limits i need to be aware of