You keep posting this Hannie - haven't you found one yet?
Balconette bras are lovely, but as i'm just one size less than yourself, I can tell you that you're liable to pop out of them if you do much exercise, so better to go for a bra which specifically uplifts and has a fuller cup.
I used to use a mail order firm for push up gel filled bras. They have some beautiful bras and matching knickers and do a great swimwear range too. See the following link.
I agree with Ice Maiden. Balconettes are only good for smaller sizes. The best way to find something that fits well and does what you want it to do is to go into a shop and try on a good selection. Try Charnos. They're lovely.