i do think, that unfortunately you get what you pay for with cheap bras and they just don't give the support you need. Bravissimo has a great selection and most are £20 -£30 which is alot of money for one bra but worth paying that little bit extra imo.
i know what you mean about the larger cups sizes and larger back sizes, once they get to a DD they only seem to have back sizes 34 or bigger, it so frustrating xxx
Bravissimo or my local lingerie shop. I found you get what you pay for, the support is just not enough for me in cheaper bras. I know what you mean about price though, I currently only have two bras that fit so i'm constantly handwashing.
I think what the ladies are saying about you get what you pay for is right unfortunately, although I just bought an M&S bra for £16 and so far so good. I'm a 36F now but used to be 32DD, I used to get them from Contessa which used to measure you as well but unfortunately they were bought out by La Senza and they are just not a good fit on me
I used to be a 32DD and bought from M&S or a lingerie shop (not La Senza, I dont rate their bras tbh). Now Im a more standard 34D and can buy cheaper ones from Next, but try and buy good ones from TK Max - I have a few gorgeous sets from there for about 1/3rd of their usual price