horse drawn carriages, but prince william's actually seen a different side of them. two years ago he helped raise awareness about the problem of homelessness by spending a night sleeping rough. joining him there was shea owe buck from the center point. that is a charity working with homeless people. and he told max foster about the prince's experience. >> was it very, very cold night. it was not a comfortable experience at all. it was very uncomfortable. you know, the following morning i said to him, how has that been for you? and his response was actually, the physical side of it was not the problem. it's the mental side of it that is the problem. and the mental side is people's reaction to you as they pass by. the sweeper comes in mindlessly. people completely, you know,