According to Wikipedia:
In 2001, a four-issue limited series titled Excalibur, featuring Captain Britain, Meggan, Psylocke, Black Knight, Sir Benedict, Captain U.K., and Crusader X, and written by Ben Raab, detailed Captain Britain's rise to become king of the extra-dimensional realm of Otherworld.
Originally solicited as Excalibur: Sword of Power, the subtitle was absent from the published issues, and, due to an error, the indicia described it as Excalibur volume 1. In addition, the solicited cover to issue #1 featured a new costume for Captain Britain, different from the one he actually received in the comic, and the cover was unused
Art by Ian Churchill