Thanks Sallies and Manny.
Sally it fitted quite loosely on me - more than is evident in the my picture and is a much less fitted than in the Ezibuy picture. I bought a 10 because in previous experience Emerge is a bit smaller fit than Capture (which I got an 8 in the navy dress) I also lost weight between ordering and receiving. I am fairly sure that an 8 would have fitted me ok, but I'll keep it anyway as I'm going for a roomy feel for hot days.
In terms of bust and waist size and the sizing guide, I should have gone the smaller size (though bigger in the hips - but actually the hips are very loose too)
https://www.ezibuy.com/shop/au.....s/p/163654
Hope that helps