I'll just explain a bit more about the Café Octet as it currently is.
Wind the clock back about 8 or 9 years and a group of Café members in the 'north west' loosely speaking - Liverpool / Manchester / Lancashire / Cheshire sort of area would meet sporadically to noodle and chat...
That kind of fizzled out.
Some of us decided we'd like to meet to play together. It started with just three of us (me, @trimmy, and @Jeanette). We met at my house and played some arrangements for trios (we were sop, alto, tenor). The hardest part was finding arrangements for that combination of players.
Once we started posting about it, more people became interested and we started to meet once a month on a Sunday afternoon.
The personnel have changed a bit as we've gone along. We've mostly been 5 or 6, but currently we're 8 and we can have two each on sop, alto, tenor, and baritone. We're not limited to SSAATTBB arrangements as some of us can play alternate instruments if needed.
@chadders and I do the leading / conducting.
When we started off, most of the group were not experienced 'readers' and not used to playing in a group with other players. There's a lot to learn when playing in an ensemble - you have to listen to each other, you need to keep a consistent time, you need to be aware of where you fit in the blend and adjust your volume accordingly. Got a little 'solo' - bring it out; chugging along on crotchets and quavers filling the harmony - sit more in the background, etc.
The group has improved so much in the time we've been playing and I'm very proud of them for the work they've put in.