I'm surprised so few comments have been made here. This was a very satisfying puzzle to solve, despite all the counting (which you didn't have to persist with once the contents of the grid could be matched to the result of a search in ODQ).
But I was hoping someone on here might by now have explained how 27 down works. I can see the misprinted letter; it's the lengthy description of the intended (reversed?) contents that I can't fathom at all.