Designer Nick Ormerod on how he brought Shakespeare's ancient Britons into the 20th century for Cheek by Jowl's production of CymbelineDesigning for Cheek by Jowl is very pragmatic. We're a touring company, so our productions have to be mobile: they could be in London one week, Spain the next, St Petersburg after that. Heavy scenery is a no-no; often it's shipped by road or air. Those realities are always in your min…