I like Alton Riding School, the teachers are good apart from one (mentioning no names). It can be a little bit un-organised at times but it doesn't effect the amount or quality of teaching. The hacks are quite good and if you are fairly experienced then there are plenty of places where you can have a canter. The horses up there are lovely, they range from being really calm, quiet and quite lazy for beginners but there are some that are quite wild for the people who are more experienced and enjoy a challenge. All in all I would give it a 3-4.