On all these threads, there are always two camps giving it attitude and no one ever explains what's going on.
For anyone who's lost: there are two ways to measure a bra!
The first one used to be standard in the UK and is still used by many retailers including M&S. This has you adding 4/5 inches to your underbust measurement to get your back size, then cup size is +1, +2 etc on top of the adjusted measurement. So someone measuring 29 underbust and 36 on top would be a 34B.
The second newer method as popularised by Bravissimo etc doesn't add the extra inches. So the same measurements in the above example would be a 29F or something like that.
Second method involves scooping everything you can into the cup - you thought it was sideboob or underarm fat, nope it's all boob.
Many people - myself included - find the second method loads better and if you're struggling to find comfy bras using method one it may help.
Sorry, just frustrates me that the second method is fairly new or at least gaining in popularity so it's not that people are getting it wrong if they haven't heard about it!