further confirmation of april is provided by a contemporay account in the letters of horace walpole earl of orford vol letter to george montagu esq friday april pp lord bute resigned this morning his intention was not even suspected till wednesday nor at all known a very few days before wednesday would have been the th and that accounts for the few sources that end bute's term that day this morning refers to the th downing street explains the missing days between bute's resignation on the th and grenville's succession on the th there can often be breaks in the holding of the office of the prime minister usually if the handover of power follows an election defeat or the death resignation or retirement of the current pm all in all at this point i'm fairly convinced that april was bute's last day as pm