I got intervened by the lovely bra ladies on here last year and take a 30FF in freya and fantasie.
I just went to buy a wonderbra strapless and took a load into the changing room as I heard that they come up small. They didnt have a 30FF. The one that came closest to fitting me was the ivory lace in 32F, but the band still felt loose (the same size in the smooth black style was massive in the band), any scooping came back out again. The biggest cup size 30 band they had in stock was a 30E which was way too small, but I could hardly get the band done up and it gave me horrendous back fat and the strap narrowed in to a ribbon, but perhaps because the cup was too small?
I need to order online now, can anyone advise what to order from your own experience. I cant afford to order more than two sizes at the moment. Any help appreciated.