Billins (one C172, one AA5) and Azure (two PA28s, two syndicate AA5s, possibly a DA42) are still operating as of today; neither seems about to leave, although both will inevitably be shifting office shortly and Azure have temporarily lost their accomodation so are taking advantage of the generosity of Billins in the short term for a nominal base of operations.
Aeros have, I believe, gone.
I have no current knowledge about CFS or FlyCB.
G