Hi Jerrica;
Yes Marks & spencer are the way to go. I was 42A and had a lot of trouble finding any bras, but as I have increased in size - now 44B heading towards C, it turns out that M&S have some very nice and pretty bras, even in pink with lace. I also have two 42B (underwired strapless bras from M&S (I use bra extenders with them. They do a pair 1 Black and 1 white and 1 nude and 1 pink.
I just love wearing strapless low cut off the shoulder dresses, but then I cannot go without a bra.
Marks also sell them on line now. Although I buy all my undies when I am visiting my UK House. In fact just 2 weeks ago I bought a very nice 1 piece pantie corsolette with suspenders 42B whilst in the UK As I am now very tiny down there thru 3.5 years HRT it actually looks great on me. In just wish they had it in another cloud such as Black or pink!.
Judith