As far as memory serves, in my 46 years of being both in and at the ballet I have encountered only seven ballet adaptations of the Grimm Brothers’ Hansel and Gretel. Alas, each was less memorable than the one before. Happily, the new version by the Royal Ballet’s first artist-in-residence, Liam Scarlett, which had its première last week, has dispensed with the dance numbers for cuddly forest animals and cute gingerbread men that turned the versions of his predecessors into laughable creations.