Ask H&H: Can I take a friend’s horse to shows?

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Q: An acquaintance from the yard where I keep my horse has asked if I would take her horse along with mine to this summer’s shows. Although both animals have good temperaments and get on well, they have not travelled together before. I will not be asking for payment to transport the horse, although the owner has offered me some diesel money.

Will my horsebox insurance cover me to take someone else’s horse to shows? And, if the animals don’t get on during a journey, or there is an accident in which my friend’s horse is injured, would I be held responsibile? Whose insurance would cover my friend’s tack if it were stolen from my lorry?