Justin Vivian Bond and Anthony Roth Costanzo’s “Only An Octave Apart” is set to make its London premiere this fall at Wilton’s Music Hall. The performances kick off on Sept. 28 and run through Oct. 22. The showcase will feature music supervision by Thomas Bartlett, arrangements by Nico Muhly, and costume design by Jonathan Anderson. Zack Winokur directs the show. {…}