Hi V,
Derek is correct, in that you should request all documentation, rather than specifying certain ones pertaining to your ESA decision, when submitting a SAR.
These documents should definately include your ESA50, ESA85 or ESA85A, whichever is applicable, almost certainly The LT54 (DMACR) Part 3
An ESA113 if one was sent to your G.P. for completion, and maybe a MED3 (fit note).
To check what the documents above actually are, see :
ESA Forms &
ESA medical – what forms to ask for? bro58