At last! I might just have found an ensemble that will let me join!
I just spoke to one of the local teachers who runs an amateur ensemble, to provide playing opportunities for her pupils, but, it is open to other learners too. It's for people like me, who aren't eligible to join the local orchestras as they don't play at grade 8 standard.
So I'm going along to a rehearsal and we'll see how it goes. I'm nervously excited and scared in equal measures!
I haven't had a lesson in three months, so I might embarrass myself, but at least going along with low expectations - I can only be better than that. . . I hope.