I've changed my answer from e to s following the logic set out in the thread, but it doesn't really matter as it is unchecked.
I've almost finished, just two left. I still haven't got the non thematic O. I have O?E?A?L?S. Are they the right crossers.
I can't find the non thematic F either. I have FR?A?E? I can only find one word that fits and can't see why. Any hints will be gratefully received, then I can put it away and pack for my holiday.