Cleo Marcie

I bought the Cleo Kayla, Cleo Marcie and Cleo Minnie, but each one gaps very bad all along the top and I feel no support in the cups. My breasts are very projected and narrow I feel, and even though the fullness test put me at "full on top", I feel they're a bit flat.

The only bras that really, genuinely work for me are Cleo Marcie, with Hettie a close second (both discontinued but you might be able to find) and Comexim plunges. If you’re in the US, you could try a Comexim more safely (like without having to deal with international returns) through Breakout Bras but be sure to read their sizing advice. Have you tried any Freya plunges (not high apex, and not the side support plunges)? These also usually work pretty well for projection—way better for me than any Panache bras I’ve tried, but maybe I’m weird.

If you’re like me and also want some of the fancier looking bras for your collection, it might be worth trying the Cleo Marcie or the Cleo Piper longline. Both of those fit me pretty well, so maybe they would work for you as well?. FYI, since i know i will always want more 4520’s, i keep it in my Amazon cart all the time as a “save for later” item. I regularly save things there that I don’t need immediately so that i can check on the prices when I’m checking out with other things.

US 36G = UK 36F, so this bra is 4-5 cup sizes smaller than the calculator recommendation. I agree with your assessment that a 36 band will be more supportive in most brands, so I would recommend trying 36GG, 36H, and 36HH in UK brands. Potential styles to try: Panache Jasmine (balcony), Ana (plunge), or Andorra (full cup)--Panache runs tight so you might still need a 38; Cleo Marcie or Hettie if you can find them (they are discontinued); or Elomi Matilda, Kim, or Morgan. Polish bras (as already suggested) would indeed work well for you, but those are more difficult to ascertain your size and return, so I would start with more projected UK bras and troubleshoot from there.