This thesis begins with a summary of the general management of faecal incontinence and constipation. This is followed by a review of the literature to support the use of neuromodulation for these conditions. The first study reports the effect of alteration of pulse width and frequency on sacral nerve stimulation for constipation. The next study investigates the outcome of transcutaneous stimulation of the sacrum for faecal incontinence. The outcome of pudendal nerve stimulation is reported for those who have failed to improve with sacral nerve stimulation. Lastly the effect of unilateral transcutaneous posterior tibial nerve stimulation is studied and applied to bilateral stimulation.