Bra intervention took me from a M&S 40DD to a 36H. The difference is amazing:
The middle bit of the bra actually sits on my ribcage for the first time ever.
I can buy bras with side support that don't rub my inner arms because my "underarm" boob is now in the right place - in my bra cup.
I don't have the 4 boob look.
My shoulders don't get sore with the weight of the straps as the band is now doing most of the supporting as it should.
Now I am wearing the right size I have found cheaper bras are better, I now have 8 well fitting £20 bras in lovely bright colours, rather than 2 ill fitting £50 bras in nude.
I am just sad it took me until I was 46 to get a correctly fitted bra!!
StatisticallyChallenged, Marriednotdead and SorrelForbes (and others) are not tossers, they gave advice, its still up to you to decide to try on different brands/styles to see if the thing fits you are not!!!! I had over 20 bra's delivered/returned to figleaves in lots of sizes before I choose the brands/styles that fitted me best, some in 36H were an awful fit, others perfect.