I've now completed the left hand side ( mainly by guessing at some definitions, with much word-play still to be unravelled), and I've seen the character and their replacement. Is the other character in a symmetrically reflected position on the RHS? If so, I've got an obvious answer for 8d wrong!
Despite "solving" 11,12,13 and 14ac, I have very little idea of how the two clues interweave, and hence what the actual clues for the RHS are.
Tips please?