It's the year 1950. The world figure skating championships are about to be held in London, the first grand prix at Silverstone and the peak district will soon become the UK's first national park. But most importantly, William McDonald of Glasgow just invented a marvellously munchable snack. With squashy meringue, a crunchy biscuit base and real milk chocolate coating, it's the same snack you'll find inside this box today, but now with a milk chocolate and salted caramel twist.