Prince William has whisked Kate Middleton off to Mustique for her second holiday on the exclusive Caribbean island in less than a month. The 27-year- olds flew out on Wednesday after William finished a helicopter training attachment on Anglesey two weeks earlier than expected. Kate spent a fortnight on Mustique with her family at the beginning of August. She was back home for just ten days - during which she and William attended the wedding of their close friend Nicholas van Cuts