Well I'm just back from bra shopping and it was a disaster 
Bravissimo lady looked a guessed going from a 34D to a 32F. However I was able to put the 32 on the tightest hook and twirl it round my body so she suggested a 30. Tried it on 30FF (i think) and she said now that we've sorted your size someone else will be in with some different styles for you. Another lady came in with a few bras (one was the Alana can't remember the others) and left. Tried them all on but they just weren't right. Felt back fat was a bit much and the cups were empty at the nipple area but a bit too tight at the top.
Then nothing....was in the changing room for ages and no one came back
so I left...braless
Then went on my merry way to M&S. Nothing in a 30 back so tried on the only 32F I could find, which did fit but was toooo ugly.
Then off to HoF. Tried on a 32F which again seemed to fit, a thriump i think but again tooo ugly. Only had a 30G which was far too big.
So from a hellish afternoon shopping i think i may be a 32F, but i need quite full coverage. Found the balconette styles were leaving me a bit wobbly at the top.
So I've given up on the high street and am going to try on line, so where is best for returns, because I have a feeling I will be needing to return some till I get this right 