Yes there is - either go up past Powderham Church and where the gates to The Castle are on your left, go straight on up and over by the Belvedere, and over to Kenton (although have had reports very overgrown) where there are bus stops on the Triangle or go towards Starcross and there is a footpath on the right by the river Kenn coming out of the Castle grounds, this goes across fields to the A379 and a bus stop on either side of the road.