By the end of the Victorian era, Scotland had become a favourite summer holiday destination. But what happened when the chill winds of winter began to blow and the tourists packed their bags and headed forhome? In this final episode, Paul Murton travels from the icy shores of the Lake of Menteith to the summit of Britain's highest and most wintry mountain, Ben Nevis, to discover how Scotland was first promoted as a winter holiday destination - after all, 'it's just like Switzerland' - isn't it?