William Caxton's (1485) edition of Malory's Morte Darthur was thought to be the only surviving version until, in 1934, a new version was found in Winchester College which was said to be the work of two late 15th century scribes. The two versions differed in many ways, not only in the odd spelling, word-order, word-division and prefix, but the episodes differed in length and the overall structure was different. This study revisits both versions and asks what happened in Caxton's workshop and whether Caxton edited a series of stories by Malory into one final version.