The script for the play is currently filed in the British Library in the Manuscript Collection as Play no 1965/50, Lord Chamberlain's Licence No. 356, November 1965.
The writing of the play is credited to both David Whitaker and Terry Nation, although Nation actually had very little to do with it.
An advert appeared in The Stage newspaper in October 1966, in which John Gale Productions announced that they were putting their entire stage production of The Curse of the Daleks, including the Daleks, up for sale. The Dalek props, hovever, did not get sold - they were recycled for Daleks' Invasion Earth 2150 A.D..
The frequently used title device "... of the Daleks" did not originate with this story. That honour actually goes to the comic story Invasion of the Daleks.
David Whitaker credits this story as coming from one of the Dalek Chronicles.
Five Dalek props were used, one painted as a Black Dalek.