I phoned Dynamic Health, they have moved me to the Huntingdon waiting list (and I have warned my boss I may need to take more time off for appointments as a result!) and confirmed they're now starting to see referrals from early April, so hopefully only 3-4 weeks before I hear from them? *fingers crossed*
I filled it the GP's triage form with a request to see someone about my second shoulder, and whether it's possible to get a steroid injection early before it freezes, they've texted to say a GP will look at my case on 2nd July and may call or invite me to come in. I particularly love that it will be two weeks before they get back to me when the course of naproxen they prescribed will run out in 4 days, but hey, could be worse. If it actually helped noticeably I'd send an admin request for more to keep taking in the meantime.
I've got an email back from the Spire saying they can't give me a table of expected costs as it depends on the consultant, so I think they're out in favour of Bupa if I do go private, but I'll hold off on that for another month and see if I hear from Huntingdon!
And I've booked another session with my private physio for Friday, in case she can give me some more useful tips for the meantime.