Thanks to some mners on s&b, I re-measured myself according to the boob or bust website, dropped down a band size and up 2 cup sizes (32b to 30d). The bras are definitely a better fit.
However, after a day of wearing one of my new bras, I was really uncomfortable. The bra left me with marks around my chest and back and I was desperate to undo it by the end of the day. This can't be right, surely?! I've measured and re-measured and I am def 30ins under the bust.
What is the answer? I wondered about a bra extender (I used them when I was pregnant) but if a new bra is a good fit then surely that shouldn't be necessary, right?