Just been to debenhams for a bra fitting after reading an old thread on here. I've been wearing a 34a since I was 14 and never been fitted since I was measured by my mum using the old measure round rib cage and add 4 inches. Slightly bemused to have come home with two 34dd and three 34e's that fit! 
So everyone jump on the booby band wagon it's quite the thrilling ride!!