Horse & Pony Books:
(HODDER & STOUGHTON 1956)
SUMMARY: Twins Adam and Jane come from America to live with their uncle in England. They have no idea what to expect, and what they find upon their arrival is a surprisingly young uncle, an incompetent housekeeper, twin horses and a spoiled bull! While Adam prefers the bull, Jane learns to ride and hopes to make the Pony Club Team.
(HODDER & STOUGHTON 1958)
SUMMARY: A pair of children despair of living with their stuffy social climbing grandmother and long to live like the scruffy but happy horse dealers, the O'Briens.
(HODDER & STOUGHTON 1960)
SUMMARY: A family learn to cope with country life when their father inherits a farm. Not sure how much horse content.
All hard to find, especially Match Pair, and may be quite expensive.