The Shakespeare virtuosos are about to share a stage in a modern-day version of the Scottish play. Fresh out of rehearsals, they discuss PTSD, childhood ambition and what makes them angry David Tennant and Cush Jumbo walk into the Donmar Warehouse's offices, above the theatre's rehearsal rooms in Covent Garden, and sit down on a sofa, side by side. Tennant has that look his many fans will instantly be able to call to…
