You're some way ahead of me, cloverjo. I have an incomplete grid (missing 1ac/dn, 5ac, 7ac, 17ac, 18ac, and 15dn). I'm trying to use the fact that the digits F, E, ..., 2, 1 must be present somewhere in the grid to complete 17ac, 18 ac, 15dn (it worked for '8', I think/hope) together with the divisibility information.