I have virtually a full grid ( one blank cell ) and know what needs to be highlighted and thus the theme. I have an answer to 38 down but, if it is right, the unchecked letter is either N or V. Any hints would be gratefully accepted.
I just haven't got to grips with this one yet. I can only presume that the "reductions are all abbreviations. Can anyone help with 22d ... Very animated coal tit doesn't finish flying about "?