Thank you both for your input, still being very stupid....4a you say tribe leaders??
The only ones I have managed to solve are:- 24a/32a/3d/7d/16d/22d & 31d, as they have all fitted, I presume they are normal (if anything in an EV xword is ever normal that is!) The only thematic clue I have managed is 19a and the positioning of the last six letters suggest the three numbers, but maybe I am being too hopeful, and I can't work out what I am supposed to do with this nugget of info. always supposing I am on the right track.