No you dont have to tell them
and when they ask
say they arent involved. - I suppose you might say there is a later will. wills are private UNTIL probate is granted and then they are public
(bitter experience from trying to get an exec to admit I was a beneficiary. In the end I wrote - "things have changed. The will is published and I find as I said I am a beneficiary for X and I want X"
and as cool as a cucumber he said - "X has been given away I regret to charity, soon after his death." Less cool as I muttered very loudly - breach of trust, even more uncool as I mentioned Law Society for malpractice]