Chart Show TV has just left Freesat with no warning, but is still available on Sky.
There is now only 1 CSC channel left on Freesat (The Vault), out of a total of only 4 remaining music channels. Keep It Country is on 516 on Freesat, which shows how many music channels freesat used to have.
CSC used to have 6 channels on Freesat, and still have all 5 remaining channels on Sky.
Vintage TV also left freesat a few weeks ago, citing increased carriage fees as the reason. Maybe this is the reason for Chart Show TV leaving as well, together with the other CSC channels leaving in the past, but seems a bit odd for them to remove their flagship channel, or maybe it isn't anymore. Maybe the Vault gets higher viewing figures these days, with the various non-music shows it is increasingly showing.