The president of each convocation as a whole and of the upper house is the archbishop of its province; each lower house elects for itself a president known as the prolocutor who is responsible for communication with the upper house [REF].
By virtue of their membership of convocation bishops and clergy are members of General Synod; thus the members of the convocations now all attend sessions of General Synod and can always conveniently meet during recesses of that body (which is, indeed, the only time they do meet nowadays).