I am really confused.... I've been wearing a usually comfy bra today, in my correct size (as per previous bra-intervention help!), but have just got changed because a) I've just had my haircut and have got those horrible itchy bits down my back and b)I had a 4 boob problem going on... This has never, ever happened before!!
I usually measure a 28DD / 30D depending on brand. I tend to go for the 30 for comfort on the band - having been rescued out of my M&S 34B, I never could get used to the tightness of the 28.
I've just measured and I'm 29 under, can get it to 28 but that is pulling very tight, with an over measurement of 36. 
doesn't this make me a 28FFish?
Where the hell has the extra boobage come from?! I haven't gained weight or anything, and have certainly never experienced overspill!