I only fished the Tiverton Canal once and that was in a match and where I drew had been polluted so we could only catch tiny pike. I remember that it was noted for tench so local advice might help, used to be Tiverton angling club. On the Exeter Canal I did well on the pole for roach with maggots but some areas had bream worth fishing for on the feeder, ask in Exeter Angling Centre for advice and I believe you will need a day ticket. Don’t know who proof read that book but it’s Countess Wear!