I'm not in Exeter now but was there between 2004-14. Know some of the yards around there. It is a very horsey area but also quite variable. E.g. great hacking around the racecourse, really not so good the other side of the A38. PM me if you like.
I used to live in Exeter, as PP said, it is very horsey but the hacking is a bit hit and miss, where I used to help exercise you had to go over or along a main road to get to any bridleways or quiet lanes.
That said it was a brilliant place with a good horsey community. If you have any questions unanswered feel free to message me, if I can't answer them my horsey friends who are still there can