My garage confirms the info given by Rspannerman concerning the Trailer Stability Assist, but the technician went even further - apparently even when driving solo if the Kuga senses that it is cornering too fast and is about to roll, the brakes are selectively applied to prevent the vehicle from tipping. He reckons that they are virtually impossible to roll, but I am not about to test this one out ...
Incidentally, there appears to be a shortage of genuine Ford towbar kits. I opted for one, in order to ensure the benefits of Trailer Assist, and put it into the local Ford Garage for fitting. It came back with an apology - once they sorted the bits for the towbar supports they found some pieces missing. They then tried all UK Ford agents, without success, and then all agents in Germany - again without success. The bits are now on back-order in Germany, with predicted 4 week wait. I hope that none of you are planning a summer holiday that revolves around caravans/trailers ...