Rob Marshall’s big screen version of the Stephen Sondheim musical has taken nearly three decades. Emily Blunt and Meryl Streep just about make it worthwhileThe path to the big screen for Stephen Sondheim’s fairytale mashup has been long and winding. A read-through was held more than 20 years ago, with Goldie Hawn and Robin Williams as the infertile baker and his wife, Cher as the witch who commissions them to fetch bits and bobs (cow, slipper, cape, hair etc) from the forest so she can break the spell, Danny DeVito as the giant, Steve Martin the big bad wolf and Roseanne Barr as Jack’s mother, fed up with her son’s bad haggling.