While most theatres brace themselves for the annual invasion of prancing Nutcrackers and flying snowmen, Sadler’s Wells offers something that is mercifully not as sugary. Never-ending love and magic kisses might be at the core of Matthew Bourne’s long-awaited take on Sleeping Beauty — aptly subtitled ‘ A Gothic Romance’ — but there are also bites of the Twilight saga genre, demonic creatures and a fair amount of gender-bending.