In my experience people in the UK can tend to be a little conservative so perhaps the BF Mummys actually "like" to be segregated? Just a thought.
Exactly what I think actually. I met a few friends for coffee who also had babies and (sadly only) 2 of them are b/f and they were soooooo self aware when we were out. In fact, one only met me for an hour because she didn't want to b/f in public. There I was sitting with my boob out (haha, not quite but I wasn't scared to feed in public)!!