Renewed appeal: can anyone help on the final stage of this Ifor cracker, namely replacing the "vacant cells": I don't follow how to proceed, let alone have a solution. Ev'thing else finished, though. To help you will have to download (link already given). I am willing to "betray" several things if only this last part can be made clear to me!
crossword solver help forum is running a similar thread you may find help there as well / there asking for members of this site to help them same proplem as you good luck this time this was great puzzle