My neighbour asked me to post that she has found that ASDA on line do a very good post operative bra.
She also says that the sizes they offer come out rather small and you may need to order one that is a bit bigger than your normal. She says they are really comfortable in a way that others arent.
https://direct.asda.com/george/women/br ... lt,pd.html
Asda George do post to France for £5.00.