Stephen Sackur speaks to Akram Khan - globally renowned as one of the great contemporary dancers and choreographers. In every culture on earth dance is a physical, joyful form of expression and communication. It is, in a way, the world's most basic common language. Khan epitomises the ability of dance to cross borders of time and space - he is British by birth, Bangladeshi by family heritage. His performances weave together influences from East and West, past and present. How would he define his dance?(Photo: Akram Khan (R) and Tamara Rojo (L) perform during a dress rehearsal of English National Ballet's Lest We Forget, 2014. Credit: Ian Gavan/Getty Images)