The most useful link I can share is for Flat Friends. Flat Friends has been set up to support women living without reconstruction after mastectomy, due to either a breast cancer diagnosis or preventative surgery. There is also a Facebook page and a closed group.
If you like to wear prostheses then request your free knitted knockers! a UK based registered charity that has been in operation since January 2014, knitting and crocheting 100% cotton breast prostheses for women that have undergone a mastectomy or lumpectomy.
Next up is abcdiagnosis. A web site created to provide information to help you make the right decisions after your diagnosis including information on surgical options.
And if you like what I am doing, then you might like Loose Debra! Loose Debra is an ever evolving catalogue of tops, for smaller busted or flat women, that look good without having to wear a bra.