I've seen a fair few threads on here wondering where to find large maternity bras, and struggled a lot myself. Eventually I found something here that fits my comedy sized milk buckets and far beyond - goes right up to 46F and 48E!
Thought I would post the link in case it's helpful to anyone else - OMG it's made feeding in public so much easier than unhooking a normal bra and trying to hook it back again whilst juggling a screaming baby and a feeding apron!
www.afabra.com/lingerie/maternity