^^^ The information about a grant of a representation being issued is in the public domain. The administrator of the estate (who will be the exceutor of a will where one was left or the person to whom letters of administration were granted where there was no will) will not be aware that anyone has obtained the information.
However the only person whom you can ask to let you see a copy of the accounts is the administrator of the estate so, by obviously, he/she is going to know that you've made such a request.