Behind the scenes videos from London's biggest theatre shows

What does it take to keep a theatre production running for months, years and decades on end? A bit of love from Time Out's theatre critics certainly helps, but in reality it's the tireless work of make-up artists, costume-makers, production staff, directors and – of course – actors that really makes the difference between forgettable folly and West End legend.

Check out the videos below for a glimpse of what goes on backstage at London's biggest shows.