David Tennant had his operation earlier - for a prolapsed disc, which will keep him out of Hamlet until the New Year. For further info go here
He issued this statement: "It is hugely disappointing for me to miss these appearances. My back problem has progressed to the point where it is impossible for me to carry on without surgery. I want to get back on stage as quickly as possible and I am grateful to Ed who has courageously got ot grips with the role but in a much shorter time. It is a fantastic achievement".