If a will has been left appointing executors who are able to act, the will speaks from death and executors can therefore act (if they are in funds to do so) before the Grant of Representation (ie probate) has issued. In all other circumstances, (ie no will, or where there are no proving executors), the administrators should wait until the Grant of Representation has issued before they can formally act since their authority derives from the Grant rather than the will.