Ask H&H: horse B&B

Q: I am hoping to run a rural B&B and would like to let guests bring their horses. I imagine most owners will look after their own horses, but I can offer full- or part-livery and will provide a secure yard for horsebox parking. I will take out public liability insurance to cover guests, but what extra insurance will I — or the guests — need for the horses and equipment? Would I need planning permission or change of use?

RB, Sussex