Well, I haven't heard anything from the forum which is disappointing.
In terms of an update: I'm 4 weeks out of a cast and flexibility has returned slowly to approx. 100 degrees. I need crutches to move around and I'm hovering between using one and two crutches. I do currently feel like I'll never be able to walk properly and without crutches again - and I can only hope this is transient and that I am wandering around soon enough.
The pain doing the physio is quite intense around the knee joint, extension exercises hurt the most.
I've been told I should be able to walk without a crutch around 12 weeks post-op (which is just under 3 weeks from now).
I'll pop back in then and update the thread again. I'm hoping that this will at least help people in the future who stumble here via google.