Hi I've ridden there a couple of times but stopped going as didn't get on too well with instructor, if you're really into dressage shes good but I was getting back into riding after 10 years so a bit rusty and she didn't have much patience with me.
Lovely facilities and lovely horses.
The above has a couple of good reviews here if that helps your decision on where to go:
http://www.ukhorseriderguide.com/listings.asp?sector=LiveryYard&country=England&county=Leicestershire