Leicester Sq cinema-ticket prices are brutal, so wait until the first-runs have moved to the Prince Charles, central London’s cheapest cinema, where nonmembers pay only £8 to £10 for new releases. Also on the cards are minifestivals, Q&As with film directors, classics, sleepover movie marathons and exuberant sing-along screenings of Frozen, The Sound of Music and Rocky Horror Picture Show.