I come from a particularly non-sporty, cat-only family (ie no dogs, horses, etc.).
I can see how my daughter would love to rude a horse. She's nearly 3 but adores them - circus type show and donkey rides, etc. I'd toyed with the idea of taking her to riding lessons. But I have the impression that it is a very expensive hobby. I posted on mumsnet in the wrong place and was kindly pointed in this direction.
We are in Hertfordshire.