I could have sworn I posted an update to this. Maybe it's still awaiting moderation. Anyway, I now have it working in VLC. gmusicbrowser and SMPlayer refuse to play ball...
So, with my Anker speaker paired and connected (using Bluetooth Manager) it would not appear in PulseAudio Volume Control until I entered
Code:
sudo pactl load-module module-bluetooth-discover
(from
this post) in a terminal. From then on it has always appeared, even after a restart, don't ask me why.
gmusicbrowser and SMPlayer still played through the system speakers, though, as did VLC until I discovered you can select the Bluetooth speaker in its Audio menu. At last!
I think it should be possible to set things so that Pulse automatically switches to Bluetooth but I'll take what I've got for now.