We are a non-horse-riding family in SW London. DD (6) has ridden once, and is obsessed with the idea of a birthday party where everyone gets to ride. I know that Deen City Farm in Morden offer rent of a party space where you do your own thing and the children can each have a brief pony ride, but I think she'd like something a bit more meaty. Can anyone suggest a riding school in Surrey - i'm thinking Epsom type area - where total beginners can enjoy a horsey experience without me spending a total fortune?