Sick of Being Me by Sean Egan

From the Publisher

Imagine Cinderella, the two ugly sisters, and a domineering stepmother transported to a stable yard, and the day-to-day running of a riding school. Add a film crew, one drop-dead-gorgeous actor, and a determined film producer, and you have the setting for Green Wellies and Wax Jackets - a hilarious romp through the world of show jumping and equestrian activities.
Lewis Trevelyan wants a competent rider to star in his latest action film and Ursula Johnson, proprietor of Hollyfield Stables and Stud, thinks she has just the girl (or girls) for him, in the shape of her two ungainly daughters, Vanessa and Caroline.
Lewis, however, has spotted another girl riding the cross-country course - a girl who intrigues him much more, and he will do anything (well, almost anything), to track her down.

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