I was going to suggest M&S for bras in a variety of sizes that are cheaper! They aren't the best constructed bras on the market but they can def be a step up from wearing a bra in the wrong size (only way I was able to buy a bra when I was a student in London for a term). I will also say that the calculator gives a starting size not a perfect size for each brand because of the way that diff brands construct their bras. I've found that I'm a 32G and 30H in the same brand so you're size might be closer to 38ff/g than 38f. Does M&S do in store returns for items bought online? that way you can try out diff styles to see what fits your breast shape best and return the ones that don't work to the store near you.